I am having the same problem. I am on 2851 64 bit on snow leopard. I am using anydvd hd on a VM to rip, then I am using eac3to on the VM, then using mkvtoolnix v 2.9.8 on mac to make MKV, and the cool thing is now I have chapters recognized in HB this way. I went to mkvtoolnix because tsmuxer is not working on 10.6, and because I heard there was now chapter recognition in HB from MKV. It seems that if I open an m2ts file with VC-1 codec, like from Watchmen I get previews and autocrop fine. But when I do the same on the MKV from mkvtoonix I get just grey previews. When I actually do the encode, I get a valid and viewable video, it just doesn't work in preview. Is there a different version of mkvtoolnix or another mkv tool I should try? It definitely seems to be an issue with HB and the MKV, not VC-1, since HB seems to handle VC-1 previews fine from m2ts.
Thanks in advance. Here is my info from activity log window while doing the SCAN.
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[16:40:21] macgui: trying to open video_ts folder (parent directory chosen)
[16:40:21] hb_scan: path=/Volumes/Movies/FullDisc/WATCHMEN/Watchmen.mkv, title_index=0
[16:40:21] thread 138e51000 started ("scan")
[16:40:21] scan: trying to open with libdvdread
libdvdread: Using libdvdcss version 1.2.10 for DVD access
libdvdnav:DVDOpenFileUDF:UDFFindFile /VIDEO_TS/VIDEO_TS.IFO failed
libdvdnav:DVDOpenFileUDF:UDFFindFile /VIDEO_TS/VIDEO_TS.BUP failed
libdvdread: Can't open file VIDEO_TS.IFO.
GUI ERROR dialog: dvd: ifoOpen failed
Last message repeated 8 times
Input #0, matroska, from '/Volumes/Movies/FullDisc/WATCHMEN/Watchmen.mkv':
Duration: 03:06:28.41, start: 0.000000, bitrate: N/A
Stream #0.0: Video: vc1, yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 23.98 tbr, 1k tbn, 23.98 tbc
Stream #0.1(eng): Audio: ac3, 48000 Hz, 5.1, s16
[16:40:21] Found ffmpeg 44 chapters, container=matroska
[16:40:21] Added chapter 1, name='00:00:00.000', dur=30750750, (00:05:41)
[16:40:21] Added chapter 2, name='00:05:41.675', dur=30101310, (00:05:34)
[16:40:21] Added chapter 3, name='00:11:16.134', dur=26028450, (00:04:49)
[16:40:21] Added chapter 4, name='00:16:05.339', dur=16219980, (00:03:00)
[16:40:21] Added chapter 5, name='00:19:05.561', dur=25491689, (00:04:43)
[16:40:21] Added chapter 6, name='00:23:48.802', dur=15364171, (00:02:50)
[16:40:21] Added chapter 7, name='00:26:39.515', dur=26861760, (00:04:58)
[16:40:21] Added chapter 8, name='00:31:37.979', dur=26002260, (00:04:48)
[16:40:21] Added chapter 9, name='00:36:26.893', dur=24707160, (00:04:34)
[16:40:21] Added chapter 10, name='00:41:01.417', dur=21351330, (00:03:57)
[16:40:21] Added chapter 11, name='00:44:58.654', dur=13382100, (00:02:28)
[16:40:21] Added chapter 12, name='00:47:27.344', dur=22792770, (00:04:13)
[16:40:21] Added chapter 13, name='00:51:40.597', dur=24268050, (00:04:29)
[16:40:21] Added chapter 14, name='00:56:10.242', dur=11490210, (00:02:07)
[16:40:21] Added chapter 15, name='00:58:17.911', dur=14493240, (00:02:41)
[16:40:21] Added chapter 16, name='01:00:58.947', dur=17488710, (00:03:14)
[16:40:21] Added chapter 17, name='01:04:13.266', dur=38656080, (00:07:09)
[16:40:21] Added chapter 18, name='01:11:22.778', dur=10033830, (00:01:51)
[16:40:21] Added chapter 19, name='01:13:14.265', dur=19046520, (00:03:31)
[16:40:21] Added chapter 20, name='01:16:45.893', dur=10923390, (00:02:01)
[16:40:21] Added chapter 21, name='01:18:47.264', dur=16223670, (00:03:00)
[16:40:21] Added chapter 22, name='01:21:47.527', dur=27409950, (00:05:04)
[16:40:21] Added chapter 23, name='01:26:52.082', dur=23930100, (00:04:25)
[16:40:21] Added chapter 24, name='01:31:17.972', dur=31636620, (00:05:51)
[16:40:21] Added chapter 25, name='01:37:09.490', dur=21677940, (00:04:00)
[16:40:21] Added chapter 26, name='01:41:10.356', dur=31234950, (00:05:47)
[16:40:21] Added chapter 27, name='01:46:57.411', dur=37195920, (00:06:53)
[16:40:21] Added chapter 28, name='01:53:50.699', dur=18723690, (00:03:28)
[16:40:21] Added chapter 29, name='01:57:18.740', dur=30998430, (00:05:44)
[16:40:21] Added chapter 30, name='02:03:03.167', dur=16572870, (00:03:04)
[16:40:21] Added chapter 31, name='02:06:07.310', dur=23081760, (00:04:16)
[16:40:21] Added chapter 32, name='02:10:23.774', dur=26550270, (00:04:55)
[16:40:21] Added chapter 33, name='02:15:18.777', dur=22788990, (00:04:13)
[16:40:21] Added chapter 34, name='02:19:31.988', dur=14538330, (00:02:41)
[16:40:21] Added chapter 35, name='02:22:13.525', dur=26775450, (00:04:57)
[16:40:21] Added chapter 36, name='02:27:11.030', dur=36351359, (00:06:43)
[16:40:21] Added chapter 37, name='02:33:54.934', dur=14647141, (00:02:42)
[16:40:21] Added chapter 38, name='02:36:37.680', dur=23885100, (00:04:25)
[16:40:21] Added chapter 39, name='02:41:03.070', dur=18254430, (00:03:22)
[16:40:21] Added chapter 40, name='02:44:25.897', dur=16734240, (00:03:05)
[16:40:21] Added chapter 41, name='02:47:31.833', dur=18941400, (00:03:30)
[16:40:21] Added chapter 42, name='02:51:02.293', dur=22023269, (00:04:04)
[16:40:21] Added chapter 43, name='02:55:06.996', dur=25108831, (00:04:38)
[16:40:21] Added chapter 44, name='02:59:45.983', dur=36218969, (00:06:42)
[16:40:21] scan: decoding previews for title 1
[16:40:21] scan: preview 1
[16:40:21] scan: audio 0x1: AC-3, rate=48000Hz, bitrate=640000 English (AC3) (5.1 ch)
[16:40:21] scan: preview 2
[vc1 @ 0x116963600]warning: first frame is no keyframe
[16:40:22] scan: preview 3
[16:40:22] scan: preview 4
[16:40:23] scan: preview 5
[16:40:23] scan: preview 6
[16:40:24] Title's mostly NTSC Film, setting fps to 23.976
[16:40:24] scan: preview 7
[16:40:25] scan: preview 8
[16:40:26] scan: preview 9
[16:40:27] scan: preview 10
[16:40:27] scan: 10 previews, 1920x1080, 23.976 fps, autocrop = 0/0/0/0, aspect 16:9, PAR 1:1
[16:40:27] scan: title (0) job->width:1936, job->height:1088
[16:40:27] thread 138e51000 exited ("scan")
[16:40:27] thread 138e51000 joined ("scan")
[16:40:27] libhb: scan thread found 1 valid title(s)
[16:40:27] macgui: ScanDone state received from fHandle