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Regarding sync, these subtitles are designed to sync to the English stereo audio, not dubs or the mono mixes. If you’re trying to watch a dub or a mono mix with subtitles, the sync may drift in and out. Also, Project Threepio subs tend to run on the “slow” side–i.e. they start at the right time, but they sometimes display after the speaker is done talking. This is intentional, to give younger viewers and other people who need a little extra time enough time to read the complete subtitle.

EDIT: There are utilities included with the project to make the subs sync better with the mono mix, but they will still be missing the lines unique to the mono mix.