I've been using it a few weeks, and I get the following:
1. Locks up more than PD9 did
2. For some reason it seems to add a new video/audio clip all on its own. Pretty repeatable. I add a title, then a color board (to a video only clip). Bang! PD10 adds a new video/audio clip pair.
3. When I Produce to YouTube, there seems to be an arbitrary length constraint on the Title name. This was not the case in PD9
4. A (new) weird anomaly tonight: I finished all my editing, then attempted to add my standard Credits title. I inserted it into the Title track, click Modify. PD10 never comes back. Just Windows ding if I try to click a menu or button or whatever. Had to kill it with TaskManager. This happened everytime I tried. I used a new title, different title, title into a regular video track, whatever. ALWAYS quit responding. Finally just built a JPG with credits and added that to video.
5. Last week, the 3 separate video clips I was incorporating into my video: EVERY ONE OF THEM showed displaced audio from the video. Consistent displacement across the clips. These are music vids, so synching audio/video is pretty critical. Had to do some fine tuning, manually matching a drum hit to a the drummer playing, guitar strum to the sound.

Anybody else having stability issues? Or these issues? As a s/w developer myself, I would never be surprised for a new release to be followed by a flurry of patches and fixes (deadlines being what they are, bugs get shipped). I have the latest I know of (10.0.0.1012). More fixes available? Chuck Puckett
"I don't want to steal the show. I only want to borrow it for a while"
http://www.puckettpublishing.com
http://www.chuckpuckettsongaweek.com