I have just downloaded creative cloud for students to use photoshop. Every time I open the software and start a new project the whole background glitches and starts doing what I can only describe a really old school acorn computer would do if it messed up. The background screen goes black and green neon stripes/pink lines (basically invert effect) all over the work space so I can't even see what I'm creating. I have tried different resolutions, changing the colour settings etc... nothing is working. I'm not sure if this makes sense, but I'd really appreciate some help.I am using a Mac.