I think the bug is a combination thing. Threads have changed in 5.8 and Tk is reportedly not thread safe. I can't find the actual words, but I am sure I have seen it.

This is one point where the Tcl advocates seem to have a point - Tk in Perl is not thread safe, in Tcl it is supposed to be thread safe.

You might want to try fork() - in 5.8 that is supposed to have matured quite a lot, it may do what you need, I haven't had a chance to try it.

jdtoronto