I keep having the problems with video playback. For example when I play video by GM Dejan Bojkov it plays it for about 15 seconds.. than the picture disappears only the sound remains. For some videos, like those of Alex Lenderman it works allright, but for others it doesn't work. I started having this issue after there was a rewrite to support apple video format, couple versions ago. I think some people also having this problem.
New App now in Store!
And sometimes video starts with good quality but then quality degrades, like when you watch youtube on 3g.

Are you on 3G as you observe these symptoms? We're sort of stuck playing the hand Apple has dealt us here, I'm afraid. If you don't have a strong connection, Videos are "iffy."

Tactics that don't end in a Mate seem to be causing me issues (it doesn't consider them solved), 4G with Virgin Canada
More stable, better looking, better performance, a few nice features (especially if you're a videophile!)
Now in the works... LIVE Chess!
http://blog.chess.com/webmaster/new-iphone-app-in-store