Comment 62 for bug 762478

I also recently expreienced this issue. I haven't restarted my system in about a month, then had some problems with the sidebar not getting out of the way of windows. Then it wouldn't pop out and now I am having this issue where all icons are black but when I hover over the window I can read the labels and click on an icon properly.

This doesn't seem to be related to only nvidia graphic cards as I have an Intel card:

~$ /usr/lib/nux/unity_support_test -p
OpenGL vendor string: Tungsten Graphics, Inc
OpenGL renderer string: Mesa DRI Intel(R) Q45/Q43 GEM 20100330 DEVELOPMENT
OpenGL version string: 2.1 Mesa 7.10.2

Not software rendered: yes
Not blacklisted: yes
GLX fbconfig: yes
GLX texture from pixmap: yes
GL npot or rect textures: yes
GL vertex program: yes
GL fragment program: yes
GL vertex buffer object: yes
GL framebuffer object: yes
GL version is 1.4+: yes

Unity supported: yes

I'm attaching glxinfo output and result of: cat /var/log/Xorg.0.log