OS: Windows 8.1 64-bit

Objects that have round features, like Checkers counters, Go pieces, Chess pieces, etc., seem to have a box collider on them. I can put a Go piece on its end and it doesn't roll or fall over. And these are vanilla objects too, so I don't know what's going on there.

I've tried verifying the files and reinstalling the game several times, but no luck. I updated my graphics driver just in case, but that didn't help either.

Edit: Forgot to mention that spherical objects like ballbearings are unaffected.