I recently noticed that my Ubuntu 11.10 "window-grid" function is not working normally. It simply doesn't respond to my window drags to edges. I installed compizconfig-settings-manager and checked the settings on the grid option and it seems to be all set, although it's not working yet. How should I approach the problem?
Assuming that you're using Unity, try you might want to try:
compiz --replace & disown
and then
unity --reset
in the terminal (http://ubuntuforums.org/showthread.php?t=1755587).
If that doesn't solve it try looking at video drivers https://askubuntu.com/a/70440/38945.