I've downloaded something and basically messed my N900 up, the screen is jumpy and only part of it is displayed at certian times, will doing a Nokia software update through my PC fix this? I uninstalled all software that I downloaded today but that hasnt helped.

I have the same problem. The screen starts with a small Twitter-window in the upper left corner. But that's it, nothing more. I've trying to solve this for many hours now, by reinstalling and checking all my software outside scratchbox. Is this a known problem? Or am I just doing wrong?