Unchecking "Let this user be granted rights" hangs RT session

Afternoon All,

We’ve got RT 3.4.1 (upgraded from 3.2.2) running on perl 5.8.4, MySQL
4.0.16 (compiled for linuxthreads), Apache 2 and Mod_perl2 under FreeBSD
4.9 on a dual P3/500 Xeon Dell.

When I deselect “Let this user be granted rights” in the user
configuration screen the httpd instance runs up to 75% CPU and does not
return (well, doesn’t return within about 10 minutes that I’ve let it
run). One mysql thread sits at 7% at the same time.

Everything else seems to run fine!

Is anyone else seeing this?