I just upgraded from 2.0.2 to 2.3.1 and found out that there are quite a number of bugs fixed. There are, however complaints about not being able to deiconify the exmh window by clicking on the icon. With some window-managers you can click on the title of the window located under the icon, but not every window manager does that.
The bug does not seem to be windowmanager related
Environment: Solaris 2.6, tcl 8.0, tk 8.0.