> I conjecture that
 > deleting the last GUI frame from a TTY started server messes up
 > something we do not initialize properly when invoking another GUI client
 > from it.  This conjecture is supported by the fact that when I leave a
 > client frame open and fire up a new terminal, I can invoke the client
 > from the new terminal as often as I want without any problems ...

And I confirmed my conjecture here by using the attached patch.  Please
try it.  I now start thinking that the GTK bug is not a GTK bug after
all ...

martin