I have launched it at least once before I copied my backup files.. maybe?!

And I think that when uninstall MyPaint there is still that /home/user/.mypaint -folder there?!

Maybe I have to sacrifice my working installation and try to do it ...
again...
... and this makes me wondering what the hell I have been done
Because MyPaint works now and it is incredible now this speed.

I just now make crappy picture with MyPaint to show that N900 + MyPaint 0.8.2 can handle "BIG" canvases with many Layers .. without problems.