I recently got a brand new MacBook Pro - supposedly the best for editing pictures?! Anyway. When I open photoshop cc ... and open a picture, any picture I open immediately has a few squares showing on the picture or pixilation issues. If I zoom in on the photo.. the squares or pixilation cover most of the photo making it impossible to edit. Its the same photoshop program I used on my old Mac and I never had these issues?
Could you please post screenshots (including one taken at View > 100%) with the pertinent Panels (Layers, Channels, Options Bar, …) visible?
Does turning off »Use Graphics Processor« in the Performance Preferences (Photoshop > Preferences > Performance > Graphic Processor Settings) and restarting Photoshop have any bearing on the issue?
Are Photoshop and OS fully updated?
What have you done for trouble-shooting so far?
Restoring Preferences after making sure all customized presets like Actions, Patterns, Brushes etc. have been saved might be a good starting point:
Have you tested for GPU-issues yet?