You are not logged in.
After a while the window widgets (minimise, maximise and close), window frame (what else would you call it? It's a frame that goes around the window) and the panel will all become totally unresponsive to mouse clicks. The only way to get them to work again is to kill the window manager.
It's very annoying.
Offline
Also, I am not good at describing things, so please make allowances for that.
Offline
[ Generated in 0.010 seconds, 7 queries executed - Memory usage: 524.01 KiB (Peak: 550.91 KiB) ]