If you upgrade GTK library to the newest 2.18 version (comes with the new Gnome 2.28) your VMware Workstation 6.5.3 won't work well. Even if you have "Grab when cursor enters window" option set, VMware won't grab your pointer when you move mouse into the VMware window. Also, if you use ctrl-G to capture the pointer, VMware window will release it as soon as you move mouse around a little bit. Quite annoying behavior...
Fortunately, there's a simple workaround that can fix things until VMware resolves incompatibilities with the new GTK library. VMware Workstation ships with many standard libraries including libgtk, so the only thing you need to do is to force it to use it's own versions. The simplest way to do that is to add the following line to the end of the
/etc/vmware/bootstrap configuration file and restart the Workstation.
The interface will look slightly odd, because older version of GTK is being used, but at least it will work properly.