Gnome Ubuntu schwarze Fensterrahmen minimieren black window frames minimize

Solution:

1. to speed up Window minimize disable black frames
2. run a user #gconf-editor
3. go /apps/metacity
4. enable reduced-resources
5. close gconf-editor
6. go Desktop->System->help technology (handicappted)
7. enable help technology
8. ready.. now gnome windows speed up and do not show a black frame at open minimize