There have been a couple of threads in which various viewing problems with Buffy DVDs have come up. I tried to search for those, but was stymied by the fact that “DVD” is only three letters long.
In my case, Buffy S1 has problems on the third episode of each of the DVDs, and S3 with Graduation Day 1 and 2.
Is this consistent with others’ experiences? And how, if at all, did you get your problems fixed?