What happened to my flash?

For some reason my flash didn't want to sync anymore. This is the best example, as you can clearly see the flash DID fire, it was just .. well.. out of sync really. Completely clueless how this happened. Anyone? Shooting with a Canon 30d and a Canon 580EXII speedlight. Different lenses didn't seem to make a difference. Shot at Manual and Av modes. (even tried that 'P' setting. didn't make a differnce).

Halp?