My giga editor is greyed out--I can't access it.
It's worked fine in the past, but now I can't open it.
The editor for the FX module works OK.
Tried opening it from the start menu, or is that the greyed out part? I assume you mean the button in the GS Workstation GUI is greyed out...
p.s. Try looking around in your settings menus in giga, and make sure that gsedit.exe (or whatever it is) is set up to be the target of said button. If nothing is specified, that may be the cause of your problem.