Did a clean install of Wedge Alpha on my Xampp running MySQL 5.0 and PHP 5.5, worked fine. I don't think MySQL 5.5 would be related to these problems, so it must be some kind of OS setting out there.
Pandos, do you mean you think BIT should be avoided? From what I could see, there are no bugs in the current implementation (except of course for the initial scare over unsigned bits), and the worst it can do is truncate results to 0 and 1. All I can do right now is just stick to bits when I'm sure I'll only be using a boolean value, because I think it's slightly misleading and lazy programming to add a 'is_something' column, with values 0 and 1, and then decide that you want to add value 2 to represent something else, closely related but not directly. Sure.