Comment 26 for bug 224291

If it were "completely broken", it wouldn't have shipped. Worse than "completely broken" is "occasionally broken" - where it works for the developers, but not for some subset of users with an unidentified common trait.

Without a 'known bad' use case to try and fix, how do we fix it?

I'm especially interested by the suggestion that the problem does not occur for new users on supposedly broken systems - can anyone else who still has a problem confirm that?