I quote from item (9) of my Help2Help-post:
If your subtitles are "out of sync" you can use keyboard shortcuts to "time-shift" subtitles:
Ctrl+Left/Right-arrow:
. Subtitles time correction -/+ (VobSub subtitles dec/inc delay)
Shift+Left/Right-arrow:
. Subtitles time correction -/+ (
small steps) (VobSub subtitles dec/inc speed)
(Also some skins have buttons just to do that.)