Timekeeping is screwy when running on PAL. OSD progress bar is incorrect, and skipping forward often skips back, more so the further you are through a recording. There's a patch: http://svn.mythtv.org/trac/attachment/ticket/1358/ivtv-pal-fps.patch
Looks like this is in 0.19-fixes, first in changeset 8801, then further fixing in changeset 9454: http://svn.mythtv.org/trac/changeset/9454.
Apologies, changeset 9454 is where this patch has been applied.. 8801 was where the issue being fixed first manifested.
This should have been fixed by the latest MythTV snapshot. If you still have the issue reopen and document further.