This is probably again a codec matter. You can check the codecs or filter in the graph in the log file (<user_home>\.elan_data\elan0.log (or elan1.log etc.)). Ideally for mpeg-1 the first filter after the file read should be "MPEG-I Stream Splitter".
Solving the problems with codecs is high on our priority list.
It might be that on Windows 7 it is possible to specify a preferred codec per file type, but I still have to delve into that.

-Han

FWIW, here are the relevant lines from the log file. It's a lot:

Using Windows Native Media Player DS
Filters listed in the registry...
Filter: 0: RDP DShow Redirection Filter
Filter: 1: MPV Decoder Filter
Filter: 2: MPEG Video Decoder
Filter: 3: MPEG Audio Decoder
Filter: 4: WMAudio Decoder DMO
Filter: 5: Elecard MPEG Demultiplexer
Filter: 6: CMML Decode Filter
Filter: 7: Subtitle VMR9 Filter
Filter: 8: Internal Script Command Renderer
Filter: 9: Video Renderer
Filter: 10: Mpeg4s Decoder DMO
Filter: 11: WMVideo Decoder DMO
Filter: 12: Mpeg43 Decoder DMO
Filter: 13: Mpeg4 Decoder DMO
Filter: 14: Default MidiOut Device
Filter: 15: Default DirectSound Device
Filter: 16: DivX H.264 Decoder
Filter: 17: Microsoft MPEG-4 Video Decompressor
Filter: 18: DV Video Decoder
Filter: 19: WMVideo8 Encoder DMO
Filter: 20: WMVideo9 Encoder DMO
Filter: 21: MSScreen 9 encoder DMO
Filter: 22: WM Speech Encoder DMO
Filter: 23: WMAudio Encoder DMO
Filter: 24: WMAPro over S/PDIF DMO
Filter: 25: WMSpeech Decoder DMO
Filter: 26: MP3 Decoder DMO
Filter: 27: WMV Screen decoder DMO
Filter: 28: AVI Draw
Filter: 29: CyberLink Audio Wizard
Filter: 30: Line 21 Decoder 2
Filter: 31: MainConcept MPEG Splitter
Filter: 32: BDA MPEG2 Transport Information Filter
Filter: 33: MPEG-2 Sections and Tables
Filter: 34: iTV Data Sink
Filter: 35: CMML Raw Source Filter
Filter: 36: Native FLAC Source Filter
Filter: 37: Ogg Demux Packet Source Filter
Filter: 38: Video Port Manager
Filter: 39: AVI Decompressor
Filter: 40: PBDA DTFilter
Filter: 41: Decrypt/Tag
Filter: 42: FLAC Decode Filter
Filter: 43: OGM Decode Filter
Filter: 44: Speex Decode Filter
Filter: 45: Theora Decode Filter
Filter: 46: Vorbis Decode Filter
Filter: 47: MainConcept (Sonic) DV Video Decoder
Filter: 48: AVI Splitter
Filter: 49: AC3 Parser Filter
Filter: 50: MainConcept MPEG Audio Decoder
Filter: 51: MainConcept MPEG Video Decoder
Filter: 52: MJPEG Decompressor
Filter: 53: ACM Wrapper
Filter: 54: Line 21 Decoder
Filter: 55: VBI Surface Allocator
Filter: 56: CyberLink Audio Decoder
Filter: 57: iTV Data Capture filter
Filter: 58: MPEG-2 Demultiplexer
Filter: 59: CyberLink AudioCD Filter
Filter: 60: MPEG-I Stream Splitter
Filter: 61: Roxio MPEG2 Demuxer
Filter: 62: DV Splitter
Filter: 63: CyberLink Video/SP Decoder
Filter: 64: VBI Codec
Filter: 65: VBI Codec
Filter: 66: MPEG-2 Splitter
Filter: 67: MPEG-2 Sections and Tables
Filter: 68: Microsoft DTV-DVD Audio Decoder
Filter: 69: Microsoft DTV-DVD Video Decoder
Filter: 70: Sonic Cinemaster® Audio Decoder 4.3
Filter: 71: Sonic Cinemaster® VideoDecoder 4.3
Filter: 72: Sonic HD Demuxer
Filter: 73: Color Space Converter
Filter: 74: Video Renderer
Filter: 75: DV Muxer
Filter: 76: WM ASF Reader
Filter: 77: WM ASF Writer
Filter: 78: Wave Parser
Filter: 79: MIDI Parser
Filter: 80: Multi-file Parser
Filter: 81: File stream renderer
Filter: 82: VGA 16 Color Ditherer
Filter: 83: SAMI (CC) Parser
Filter: 84: File Source (Async.)
Filter: 85: File Source (URL)
Filter: 86: Elecard Stream Parser
Filter: 87: AVI/WAV File Source
Filter: 88: Roxio MPEG2 Muxer
Filter: 89: BDA MPEG2 Transport Information Filter
Filter: 90: ROXIO VCFWaveform 1.0
Filter: 91: AVI Mux
Filter: 92: Roxio Plasma CrossGraph Renderer
Filter: 93: ROXIO InputSelector 3.0
Filter: 94: ROXIO AudioGrabber 3.0
Filter: 95: Enhanced Video Renderer
Filter: 96: ROXIO ThumbnailGrabber 3.0
Filter: 97: Microsoft GS Wavetable Synth
Filter: 98: Speakers / Headphones (IDT High
Filter: 99: CyberLink Audio Renderer
Filter: 100: CyberLink Audio Renderer
Filter: 101: Default WaveOut Device
Filter: 102: DirectSound: Speakers / Headphones (IDT High Definition Audio CODEC)
Filter: 103: Annodex Mux Filter
Filter: 104: Ogg Mux Filter
Filter: 105: LVMWriter
Filter: 106: WMT Virtual Renderer
Filter: 107: My Dump
Filter: 108: ROXIO SceneRecorder 1.0
Filter: 109: CyberLink Demultiplexer
Filter: 110: VCG Null Renderer 3.0
Filter: 111: Video Mixing Renderer 9
Filter: 112: My AVI Encoder
Filter: 113: ROXIO VideoTransition 3.0
Filter: 114: CyberLink Demultiplexer
Filter: 115: ROXIO Sewer 3.0
Filter: 116: ROXIO DVDCrossGraphEx Renderer 3.0
Filter: 117: File Writer
Filter: 118: File writer
Filter: 119: Roxio MPEG Analyzer
Filter: 120: ROXIO VideoCombine 3.0
Filter: 121: VMR9 Wrapper 3.0
Filter: 122: ROXIO InputSelectorNew 3.0
Filter: 123: ROXIO QuickGrabber 3.0
Filter: 124: ROXIO MPEG Writer
Filter: 125: ROXIO CrossGraphEx Renderer 3.0
Filter: 126: Null Renderer
Filter: 127: PSI Parser
Filter: 128: Overlay Mixer
Filter: 129: StreamBufferSink2
Filter: 130: DV Video Encoder
Filter: 131: MJPEG Compressor
Filter: 132: Microphone Array (IDT High Defi
Filter: 133: Microphone / Line In (IDT High
Filter: 134: Rec. Playback (IDT High Definit
Filter: 135: PBDA ETFilter
Filter: 136: PBDA PTFilter
Filter: 137: Encrypt/Tag
Filter: 138: PTFilter
Filter: 139: XDS Codec
Filter: 140: ROXIO WAV Dest 3.0
Filter: 141: SBE2MediaTypeProfile
Filter: 142: StreamBufferSink
Filter: 143: SBE2FileScan
Filter: 144: MPEG-2 Video Stream Analyzer
Filter: 145: VPS Decoder
Filter: 146: StreamBufferSource
Filter: 147: Roxio Smart Encoder
Filter: 148: Microsoft MPEG-2 Encoder
Filter: 149: Roxio MPEG1 Muxer
Filter: 150: Cyberlink SubTitle Importor
Filter: 151: CyberLink Video Effect
Filter: 152: CyberLink TimeStretch Filter
Filter: 153: ROXIO SubPicture Encoder
Filter: 154: ROXIO Audio VCFChunker 3.0
Filter: 155: Infinite Pin Tee Filter
Filter: 156: Tee/Sink-to-Sink Converter
Filter: 157: Sonic AVC/H.264 Video Encoder
Filter: 158: Cinepak Codec by Radius
Filter: 159: Intel IYUV codec
Filter: 160: Intel IYUV codec
Filter: 161: Microsoft MPEG-4 Video Codec V2
Filter: 162: Microsoft MPEG-4 Video Codec V3
Filter: 163: Microsoft MPEG-4 Video Codec V1
Filter: 164: Microsoft RLE
Filter: 165: Microsoft Video 1
Filter: 166: IMA ADPCM
Filter: 167: PCM
Filter: 168: Microsoft ADPCM
Filter: 169: GSM 6.10
Filter: 170: Messenger Audio Codec
Filter: 171: CCITT A-Law
Filter: 172: CCITT u-Law
Filter: 173: MPEG Layer-3
Filter: 174: MicIn2
Filter: 175: MuxedIn
Filter: 176: Integrated Webcam
Filter: 177: ATI HD Audio rear output
Filter: 178: Speaker1
Filter: 179: Integrated Webcam
Filter: 180: Tee/Sink-to-Sink Converter
Filter: 181: FLAC Encode Filter
Filter: 182: Speex Encode Filter
Filter: 183: Theora Encode Filter
Filter: 184: Vorbis Encode Filter
Filter: 185: Roxio MPEG2 Video Decoder
Filter: 186: WMT VIH2 Fix
Filter: 187: Record Queue
Filter: 188: WMT Switch Filter
Filter: 189: WMT DV Extract
Filter: 190: WMT Sample Information Filter
Filter: 191: Roxio MPEG2 Encoder
Filter: 192: MainConcept (Sonic) DV Video Encoder
Filter: 193: Roxio Repacketizer Filter
Filter: 194: CyberLink Audio Spectrum Analyzer
Filter: 195: ROXIO Deinterlace 3.0
Filter: 196: ROXIO Pan Zoom 3.0
Filter: 197: ROXIO VCFStationLogo 1.0
Filter: 198: ROXIO Field Combiner 3.0
Filter: 199: ROXIO SpyPos 3.0
Filter: 200: ROXIO CPU Regulator
Filter: 201: ROXIO VCFDvrSupport 3.0
Filter: 202: ROXIO AC3 (5.1) Encoder
Filter: 203: ROXIO VCFVideoCutList 3.0
Filter: 204: Creative Video Processing Filter
Filter: 205: ROXIO AudioConvert 3.0
Filter: 206: Roxio MPEG1 Encoder
Filter: 207: ROXIO VideoInfo Transcoder 3.0
Filter: 208: Microsoft MPEG-2 Video Encoder
Filter: 209: ROXIO VCFAudioMixer 3.0
Filter: 210: ROXIO Video Effect 3.0
Filter: 211: CyberLink Tzan Filter
Filter: 212: ROXIO Video VCFLooper 3.0
Filter: 213: ROXIO Field Splitter 3.0
Filter: 214: ROXIO VCFpeakmeter 3.0
Filter: 215: ROXIO Pin Tee
Filter: 216: Creative MJPEG Decoder 2
Filter: 217: Roxio Smart Decoder
Filter: 218: ROXIO Video Resampler 3.0
Filter: 219: ROXIO ColorSpace Converter 3.0
Filter: 220: Roxio MPEG1 Audio Encoder
Filter: 221: ROXIO VCFAlphaSplitter 3.0
Filter: 222: ROXIO VCFLatency 3.0
Filter: 223: Roxio VOB Formatter
Filter: 224: Overlay Mixer2
Filter: 225: CyberLink TimeStretch Filter
Filter: 226: ROXIO Scene Detector 3.0
Filter: 227: ROXIO Audio VCFLooper 3.0
Filter: 228: Sonic AVC/H.264 Video Encoder
Filter: 229: CyberLink Audio Effect
Filter: 230: Microsoft MPEG-2 Audio Encoder
Filter: 231: WST Pager
Filter: 232: ROXIO DV Scene Detector Tee 3.0
Filter: 233: CyberLink Tzan Filter
Filter: 234: SampleGrabber
Filter: 235: ROXIO LPCMSyncFilter
Filter: 236: Microsoft AC3 Encoder
Filter: 237: ROXIO CrossGraphEx Source 3.0
Filter: 238: FA Virtual Cam
Filter: 239: Microsoft ATSC Network Provider
Filter: 240: Microsoft DVBC Network Provider
Filter: 241: Microsoft DVBS Network Provider
Filter: 242: Microsoft DVBT Network Provider
Filter: 243: Microsoft Network Provider
Filter: 244: FA Virtual Cam
Filter: 245: Roxio Vob Loader
Filter: 246: WMT Virtual Source
Filter: 247: ATI Ticker
Filter: 248: Screen Capture filter
Filter: 249: ROXIO LVM File Source (Async.)
Filter: 250: ROXIO DVDCrossGraphEx Source 3.0
Filter: 251: Roxio Transport Stream Source
Filter: 252: VCGImageSource
Filter: 253: ROXIO Audio Source 3.0
Filter: 254: ROXIO ListImage Source 3.0
Filter: 255: Roxio Plasma CrossGraph Source
Filter: 256: ROXIO QT Source
Filter: 257: VCG Video Mixer 3.0
Filter: 258: ROXIO Image/Colour Source 3.0
Filter: 259: ROXIO VCFDVSceneDetect 1.0
Filter: 260: Roxio MPEG Stream Analyzer
Filter: 261: Media Analyser
Filter: 262: Smart Tee
Filter: 263: CyberLink Line21 Decoder Filter
Filter: 264: CyberLink QuickTime Source Filter
Filter: 265: MMACE ProcAmp
Filter: 266: FLV File Source
Filter: 267: CyberLink Line21 Decoder Filter
Filter: 268: MMACE SoftEmu
Filter: 269: MMACE DeInterlace
Filter: 270: CyberLink DVD Navigator
Filter: 271: CyberLink DVD Navigator
Filter: 272: DVD Navigator
Filter: 273: Closed Captions Analysis Filter
Filter: 274: Sonic HD Nav
Filter: 275: LAME Audio Encoder(My)
Filters in the filter chain:
index: 0 name: Default DirectSound Device
pin: 0 name: Audio Input pin (rendered)
index: 1 name: Video Renderer
pin: 0 name: VMR Input0
index: 2 name: Microsoft DTV-DVD Audio Decoder
pin: 0 name: XForm In
pin: 1 name: XFrom Out
index: 3 name: Microsoft DTV-DVD Video Decoder
pin: 0 name: Video Input
pin: 1 name: Subpicture Input
pin: 2 name: Video Output 1
pin: 3 name: ~Line21 Output
index: 4 name: Elecard MPEG Demultiplexer
pin: 0 name: Input
pin: 1 name: Video (ID 224 @ Prog# 0)
pin: 2 name: AC3 (ID 189/128 @ Prog# 0)

I guess the problem is in the Microsoft DTV-DVD Video Decoder that is in the filter chain. If it possible to disable or uninstall that codec frame stepping might work.
This is one of the many problems with installed codecs on a machine. We are working on a solution for those problems.

-Han

Thank you! This has worked, mostly. What I did just now was to download and install CoreAVC, and then did a registry hack to assign this new codec where the DTV-DVD decoder had been assigned before.

Now when I use Elan I can step through MPGs and (also M2TS files, which is what I really wanted), but only by using the "advance pixel by pixel" rather than frame-by-frame. From what I can tell, the "advance forward one pixel" on my M2TS and MPG files actually advances one full frame, rather than just one pixel. The "advance frame by frame" still does not appear to work (at all), but using the pixel advance instead is an acceptable work-around for me at this time.

BTW, I decided on the CoreAVC replacement strategy after googling "disable Windows DTV-DVD", so if you think that another solution would have worked better, please let me know.

Thanks again,

TG

Actually, now the frame by frame is working for M2TS, and all I did was close and reopen the program again. Weird.