Users lose their prefix when chatting from the nether. Probably affects all dimensions that aren't the overworld. Might also happen on TL.
This isn't actually a polychat bukkit issue but a GroupManager issue.
I applied a fix to this. If someone (who is a member, ideally) would test then that would be great. There is some more that we can do, but we don't need to if what I already did works.
This still seems to be broken.