Something strange is going on. When i use a smooth brush...drawing a circle or whatever i get these hard edges that shouldn´t be there.
See this image.....
The interesting part is when i save it as a jpeg or something else it looks great and perfect. smooth as it should be!
What is the problem?
I´ve played with a lot of performance settings including updating my Geforce GT 740M
See if its any better if you create that editing in 16bit color and you turn off your GPU in Photoshop Preferences performance and view zoomed to actual pixels..