I just upgraded my pc and had to reinstall windows. When I tried to get in the mumble chat, it kept saying: "Server connection rejected: Wrong password for user." I tried all kinds of passwords but none seemed to work.
I'm still using the same hard disk. I found mumble in C:/windows.old.000/Program Files (x86)/Mumble and I found my old certificate. I tried logging in there, but it didn't work. Neither did copying that folder to the new Program Files (x86).