I'm using an n800 with OS2008. Whenever I attempt to switch between open windows or turn a desktop app on the screen goes white, then I get sent to the desktop. It does not do this when using the home button to switch windows, though.
Wild guess - I have had something similar happen on my N800/2008 (although I'm not sure about how I was switching apps) when I was running low on memory and tried to run or install another program.
Has anyone else run into this, or have a fix?