Not all recordings, but certain recorded shows give me this when I fwd. The frontend hangs for a few minutes and eventually goes back to the recorded programs menu. I'm using a simple profile that uses rez > 0 -> ffmpeg and XV-blit, Primary BOBx2 Fallback none.

2009-01-19 13:57:07.503 FilterManager: failed to load filter 'none', no such filter exists
2009-01-19 13:57:07.503 Couldn't load deinterlace filter none
2009-01-19 13:57:08.179 NVP: prebuffering pause
2009-01-19 13:57:08.668 NVP: Prebuffer wait timed out 10 times.
2009-01-19 13:57:09.168 NVP: Prebuffer wait timed out 10 times.
2009-01-19 13:57:09.668 NVP: Prebuffer wait timed out 10 times.
2009-01-19 13:57:10.168 NVP: Prebuffer wait timed out 10 times.
.
.
2009-01-19 14:04:34.513 AFD Error: av_seek_frame(ic, -1, 36069366, 0) -- error
2009-01-19 14:04:34.513 TV: Attempting to change from WatchingPreRecorded to None
2009-01-19 14:04:35.513 RingBuf(/var/lib/mythtv/recordings/2091_20090116233500.mpg): Taking too long to be allowed to read..
2009-01-19 14:06:42.413 AFD Error: av_seek_frame(ic, -1, 38505133, 0) -- error

.
. Then Myth returns to the recorded program menu
.
2009-01-19 14:06:42.894 ~OpenGLVideoSync() -- begin
2009-01-19 14:06:42.894 ~OpenGLVideoSync() -- middle
2009-01-19 14:06:42.895 ~OpenGLVideoSync() -- end
2009-01-19 14:06:43.005 TV: Changing from WatchingPreRecorded to None
2009-01-19 14:06:43.078 DPMS Reactivated.