I recently upgraded from Lightroom 4.4 to 2015 with Adobe CC. Camera RAW is updated and supports my camera (Canon 6D). When opening an older catalog, it asks me if I want to upgrade the catalog and I select yes. When viewing images in Develop Mode, they are distorted into a lot of different neon colors (image below). I tried creating a new catalog and then importing the images, and I still get the same result. Since the upgrade, Lightroom seems to be running very slow. I've got a fast CPU and plenty of RAM, so I know that isn't the issue. What's happening??
Turn off the Use Graphics Processor option in the Performance tab of preferences.