Config:

A full build of the Gnome2 platform from today.
Xfree86 4.1.0 + RH 7.2 + all red-carpet updates
for Redhat.

Problem:

Using the configurator can crash XFree86 in such a way
that X locks up the mouse and keyboard I/O, meaning that
unless the user can log into the machine remotely and 
kill the X process, the machine must be power cycled.

Repro:

1. Open the configurator.
2. click-and-hold the mouse on the button to drop the
theme menu list.
3. drag the mouse pointer across the theme list quickly.

Result: 

The themes are instant-applied as the pointer moves across
the list.  When the pointer is dragged across the list
quickly enough, XFree86 locks up.

Suggested fix:

Intead of applying each theme as it is temporarily selected
as the pointer is dragged across the list, notice when the
button release event occurs.  If it occurs over a menu item,
select that item and apply the corresponding theme.  Do not
instant-apply the other temporarily-selected themes.