I'm glad to see others are enjoying beta testing the new build. Unfortunately Boxee beta is barely usable for me.
There's a noticeable lag between pressing a key and the application actually responding. The lag seems to increase with use.
My system (which ran alpha quite):
Intel Atom 230 (1.6) 533MHz
Intel GMA 950 onboard video
I had been running Jaunty, but couldn't get the Jaunty beta build to install so I upgraded to Karmic.
I'd read that there were some issues with Karmic and the intel video cards so I tried tweaking that, to no avail. Then I opened one of my local movies in vlc and it played just fine at full screen. In Boxee beta it creeps forward.
Same with flash movies. So this is definitely a Boxee issue.
I've tried taking my display resolution down to 640x480, but that's done nothing.