I installed K2 a while ago, I quite like it. Unfortunately a WordPress update seems to have broken something somewhere.
I’ve just installed K2 RC 8, which appears to have fixed things but the nice boring, blue theme I was using doesn’t display properly. It’s probably something I could fix but as I don’t really want to spend my weekend diving into CSS code, I’m just using the other theme that ships with K2.
It’s a bit darker than I would have liked, but it’s still pretty cool!