+++ This bug was initially created as a clone of Bug #437132 +++

My problem sounds very similar to Bug #437132, except that I am running
Seamonkey 1.1.10 on CentOS 5.2 instead of firefox.  I'm not sure of the steps to
reproduce this problem as the crashes are intermittent.  However, when the
crashes occur, I see the following on the xterm from which I invoked seamonkey:

(Gecko:22468): Gdk-CRITICAL **: gdk_colormap_get_screen: assertion
`GDK_IS_COLORMAP (cmap)' failed

(Gecko:22468): GLib-GObject-CRITICAL **: g_object_ref: assertion `G_IS_OBJECT
(object)' failed

(Gecko:22468): Gdk-CRITICAL **: gdk_colormap_get_visual: assertion
`GDK_IS_COLORMAP (colormap)' failed
/usr/lib/seamonkey-1.1.10/run-mozilla.sh: line 131: 22468 Segmentation fault   
  "$prog" ${1+"$@"}

[1]+  Exit 139                mozilla

This output matches exactly the symptoms reported at:

http://www.centos.org/modules/newbb/viewtopic.php?topic_id=11589&viewmode=flat&order=ASC&start=20

at comment #23.

In my environment, "mozilla" is a symlink to "seamonkey".

The comments indicated in Bug #437132 indicate that the GTK+ problem should
hopefully be fixed by RHEL-5.2, but in querying the changelog for gtk2, I don't
see any evidence of recent patches to address this.

Relevant comments from the original bug #437132 are below:

Firefox crashes when it tries to open a new GTK dialog. The crash is inside GTK.

-- Additional comment from j.s.peatfield.ac.uk on 2008-04-11 16:25 EST --
That is certainly *a* bug in GTK with a fix available - which should obviously
be fixed in GTK.

Since the discussion in there seems to be related to problems with re-parenting
an object when it is dragged in a notebook it isn't entirely obvious that this
is the bug which is causing ffox (and tbird etc) to crash - or at least not
obviously the *only* bug...

-- Additional comment from stransky on 2008-05-29 09:32 EST --
Hopefully fixed by the RHEL-5.2 update. Please reopen if not.