Yes, it can be annoying, but most TV series have played with no issues. Even DS9 played fine for the first 10 episodes, and appears to be back on track after a few episodes. Batman: The Animated Series season 1 was the worst, as once this happened it never corrected itself.
So glad that most series-on-disc sets come w/ Vudu DCs, instead of iTunes (though some used to be w/ both), if they come w/ any DCs at all, including that Batman: The Animated Series set, which I did finally buy late last spring (while enough available disc sets were still including the DCs even though they officially expired, but still worked)...
OTOH, I haven't gotten around to checking out the new UI changes for Vudu, so maybe I'll change my tune about that before too long...
_Man_