I have experienced a few bugs. I'm not entirely if they are related to Mavericks, but they seem to have appeared after the update.

• My tool palettes ( Layers, Style, Scenes, etc ) don't "stick" together anymore. When I click on them to enlarge, they just dissociate from the others, which is pretty annoying.
• I have experienced a few other visual bugs while using Mission Control (with the gestures) ; palettes don't come back as they should, or just slower performances.