This was discovered while debugging bug 62073. From that bug: Finally had a chance to debug using the Netscape Registry you sent. Found the problem - The first profile name in that registry ends with a space. That name is added as-is to the new registry. Turns out that a registry key cannot end in a space or will cause an error. That's what happens. When migrating, we error out on the first entry because of the space, nothing else gets migrated, the profile list ends up empty, and all hell breaks loose.

What a coincidence -- I was sitting on the Mac today, and was trying out a Mac build for the first time in a long time, and noticed it hadn't been fixed. Great to see you've found the problem. Looking into the issue of there being space in the profile names -- there's no spaces in the folder names, which were created from the profile names, hm, but I'll see. Have to restart NS to check it out.

The profile that seems to have caused the problem did not end in a space, but was called "Torbjörn Sundlöf (stadshypotek)" -- probably it got confused with the parenthesis'. I renamed that profile to "Torbjörn Sundlöf-stadshypotek", removed Mozilla settings (Component Reg., Documents, Mozilla Registry) and now it finds that profile, but none of the others with sane names. Hrm.

I renamed the profiles to "Ann-Sofi" "Petter" "Stadshypotek" "Torbjörn" ...and now Mozilla sees them all, and is able to migrate. Of course, I shouldn't have to do this.

No, you shouldn't. That's why I filed the bug ;-)