So I have a new Mini, 2.0ghz, 4gb Mushkin RAM upgrade. When I try to stream video from YouTube at fullscreen on my 22" display it will play fine for about 10-15 seconds but will then lock up. If I do command option esc. for a Force quit, the video kicks back out of fullscreen to a regular web browser, and immediately continues from where it locked up just fine. This happens in both FF and Safari. Reboot does not solve the issue. Suggestions?