IRC nicks were moved over to usernames, but it seems not sanitized properly, so usernames like "odin, odinm" exist. This causes problems because they aren't valid Django Auth usernames (less of a big deal) but are also not caught by our current URLconf (which doesn't check for spaces/commas -- bigger deal). This will cause 500 errors on any page with a link to an un-resolvable profile URL.
The fix here is to write a migration that changes all usernames to valid ones. Working on it.
Commit pushed to master at https://github.com/mozilla/mozillians https://github.com/mozilla/mozillians/commit/b4e9ae6305f84f31789d9d01af5cf6c3d3ebbd78 Cleanup usernames (fix bug 737263) Migrate usernames to be free of unsupported characters.
QA verified on prod - bumping to verified - as far as I can tell we're not receiving any of the tracebacks that we were previously seeing (bug 736596).