Ubuntu :: Firefox And Other Applications Just Crashes Sometimes With Complete Logout

Already in Ubuntu 10.10 I faced some odd behaviour after the login, e.g. the icons for maximizing or closing were gone, but after reloading with compizfusion icon, they appeared back (for both compiz and metacity).

After the update to 11.04, certain applications just crashes permanently after some time, like Firefox, Synaptic or Libreoffice (now gone). Additionally the screen shows sometimes orphaned pixel or logs out completely.

I'm using an Intel graphic cards from the notebook Hp 2740p. I couldn't find any errors in the log viewer and also a fresh install of Ubuntu 11.04 in Unity and Gnome as well in Linux Mint, couldn't solve the problem. I also deleted config folders from my homefolder, like .gnome, .gconf, etc. to see if there would be a change. But this strange behaviour still persists.

As I setup a new user the behaviour was gone for sometime, but came finally back after some days, without messing around with any configurations.