Photoshop redraw bug on iMac Retina after updating to Sierra.
After updating to Sierra from El Capitan I've noticed a repeatable, incredibly frustrating bug that occurs when using certain tools and layers. Say for instance I apply a fill on a layer, on screen it will not show that anything has occurred unless I scroll or zoom in. It doesn't always happen, sometimes Photoshop runs like a dream, but once it starts it will not seem to fix itself unless I reboot the entire machine. Has anyone else experienced this? And yes, I have tried every combination of turning off the graphics processor, adjusting its advanced setting, etc. Once it starts it doesn't matter what settings I change.
iMac (Retina 5K, 27-inch, Late 2014)
4 GHz Intel Core i7
24 GB 1600 MHz DDR3
AMD Radeon R9 M295X 4096 MB