I ran into an old namespace bug, which, according to the following email thread: https://firstname.lastname@example.org, should be solved from 8.4. Was the patch taken out again? It works fine when I work from the local ":0.0" display.
I run TCL 8.5.5-2.81 from the Suse SLES 11 SP1 distro.
Please let me know if you need extra information.