I've had a similar problem. After uninstalling emerald (sudo apt-get remove emerald) everything is back to normal again.
Seems like emerald and unity-window-decorator are not a good match. Not sure if the OP also has emerald installed, but for me this was the solution.
I've had a similar problem. After uninstalling emerald (sudo apt-get remove emerald) everything is back to normal again. decorator are not a good match. Not sure if the OP also has emerald installed, but for me this was the solution.
Seems like emerald and unity-window-