Hi,
i have a problem with the gnome desktop, when i try to see a .avi mpg … it comes a black screen so when i switch to the kde it works fine … can you help me ? It doesn´t matter wich player i use the same problem on each player e.g. vlc, kaffeine …
Another rather speculative possibility is the same application video mode does not work for Gnome and KDE ? And so you may need to tune the applications video output mode so as to be more compatible with each desktop.