I got the following problem:
Well, just installed Fedora 19 alongside to my Debian installation. While GNOME Shell is working perfectly fine when running with Debian, there are some strange display errors (e.g. coloured backgrounds of icons; when opening the dash (where all installed applications are listed) the background not only darkens but turns completely black).
Some information about the actual machine running now Fedora 19: CPU: AMD Athlon 5050e, GPU: nVidia 7800GT (128 MB GFX RAM), RAM: 2 GB (I assume this is all information that's necessary, if not, please ask in the comments).
Has anyone any ideas on how to fix this?