When I try to use a tool the tool gets stuck and I can't click on anything else. I have to force quit the App. I can't change tools. I can't use tools. I can't do anything. I made sure that I updated it and I even reinstalled the program and it still won't work.
I'm having the same problem. I updated my Mac to the 10.10 Yosemite version yesterday. Today I noticed that I can drag images, apply filters, etc., but as soon as I use a tool and click on the image the program freezes up.
I tried reverting to the old Mac version, but I was told by Apple customer service that once it's installed it can't be uninstalled. I'm hoping for an update from Adobe to fix this problem. Until then, my work is at a standstill.