Is 4.0.1 (build 1178) really so good? I could not find a single reported exception from build 1178.
Can it be that it was released so quietly that only very few users have discovered it and actually use it?
Of course I'm hoping that it has actually been refined into a robust version. If so, I would humbly suggest that JetBrains now take some time to process (and probably archive) the enormous backlog of issues to be fixed (about 6200). But that's just what I think :)