Yesterday I was trying to install GTK+ libraries(pango,ATk,glib,gtk+,gobjects-introspection). After I installed them every thing was OK. but today when computer boots up, my desktop changed to default desktop(when first time Linux boots up).Right upper icons include power button, clock , etc disappeared and when I try to change the background nothing change. On top of all, when I start MATLAB, a error message box pops up. I know it's something with OpenGl, because I ran it on command line it's working properly.Even I changed desktop environment and for new environment the problems still exist. what's the problem? Is that GTK? How can I Solve it?
Any Help Appreciated