From: Ole Jacob Taraldset <ojt>
I just installer RedHat 5.2/Intel and use the satndard
window manager (AnotherLevel). Everything is OK except that
after a while the buttons on top of each frame (minimize,
etc on the right hand side) stops working. Also the Redhat
button on left hand side does not show the menu. It does not
help to restart fvwm2.
Most likely the NumLock key is pressed.
I encounter the same problem. Window title bars will not
accept any mouse clicks or anything. NumLock is not pressed.
Restarting fvwm doesn't help, need to restart X.
I'm running the XFree86-3DLabs-188.8.131.52-52 server. The bug
has been there ever since RH5.0 and the Xsuse server at the time.