Hi,
It sounds like old assemblies are installed on your computer... (by the way, it has nothing to do with IE6, assemblies are loaded on server side :)
Please try to check for old VWG versions, remove all VWG SDK versions and reinstall the one you use, also, make sure to empty Gizmox.*.dll from your bin directory before you re-compile.
I hope this will help you.
Regards,
Itzik Spitzen