I just installed YMJ 2.0.2 on my Samsung Q1 UMPC which has a default native resolution of 800x480. When I started up YMJ the first time it seemed to hang.

The main window was all I saw and it was unresponsive (but didn't have high CPU use). The cause turned out to be the low resolution 800x480 I was in: the Welcome wizard was failing to display itself.

Killing YMJ, switching to 800x600, and then restarting YMJ, I was able to get the welcome window to display and get things running along nicely.