Don't know the right place for this but..:

I've this N900 for a year now and today I ran into this quite annoying problem...

So your application screen's backround should be darker than the wallpaper usually is, right? Now something is wrong and mine backround is always the one from which I've moved to the applications menu (or to the multitasking screen). The real problem is that I can't read the texts of the applications since backrounds have white areas also...

I had an-Droid theme installed and wanted to return to the stock Nseries theme and this is when the problems started. I also had the Catorize and Theme Customizer installed but removed them while I tried to fix this.

Any good ideas?