Photoshop Elements hangs now when I use brush/eraser tools following the installation of Mac Yosemite OS on my Mac. Others have reported this problems on other feeds. I hope that Adobe will give priority to fixing the apparent incompatibility of Printshop Elements with Yosemite OS.
Rather than finger-pointing back and forth between Apple and Adobe, seems to me that both Adobe and Apple need to collaborate and find a solution. Adobe: you need to do your utmost. Your user community expects no less.