There seems to be a bug in VMWare, at least in Linux when you switch back and forth between the Guest and Host sometimes the Alt key gets stuck in the Host, where in the guest the key is not stuck. This simple script solves the problem:
#!/bin/sh
/usr/bin/xmodmap – << XXX
clear shift
add shift = Shift_L Shift_R
clear lock
add lock = Caps_Lock
clear control
add control = Control_L Control_R
clear mod1
add mod1 = Alt_L Alt_R
clear mod2
add mod2 = Num_Lock
clear mod3
clear mod4
add mod4 = Super_L Super_R
clear mod5
add mod5 = Scroll_Lock
XXX
Just run it and it will clear the stuck keys.
