I'm having the same problem starting today. The tools and menus work, but the the display of the image I'm working on is frozen and unresponsive. If I minimize Photoshop and restore it, the image is blank instead. Closing/opening Photoshop seems to fix it for a while. Closing the file within Photoshop and reopening it there also fixes it for awhile. The lastest update must be bugged. 😕
EDIT: It looks like the Hand Tool is what's setting it off, at least in my case.