i have a simple question that every time, i do something it don't take the effect until i zoom in or zoom out or change my layers, So i want cc to take effect as soon i as i draw or write something, for example if i use magnetic lasso it won't take an effect until i zoom in or zoom out or switch my layers, i have a same problem with other functions, please help me with this problem and thank you so much!!!
May I know which version of Photoshop CC are you using and on which operating system?
Please try unchecking "Use Graphics Processor" from Photoshop's preferences > performance.
Let us know if it helps.