Comment 116 for bug 195982

@krouskop, which problem are you referring to exactly? The xmodmap problem can be reproduced in at least two ways: (1) hold the ctrl key while you move the mouse from the guest to the host as described by Oren Held in #110, (2) going full screen with CTRL+ALT+ENTER while VM option "Grab keyboard and mouse input on mouse click" is switched on. I can reproduce both on my Hardy machine (x.org 7.3, VMWare WS 6.0.3 and 6.0.4), but my Gutsy laptop (x.org 7.2, VMWare WS 6.0.3 and 6.0.4) does not run into the xmodmap problem.

Have a look at http://communities.vmware.com/message/966014
There are quite few reports about the same problem in different distros. What we all have in common is the upgrade to x.org 7.3.