Please post a screenshot that includes the pertinent UI elements (Layers Panel, Options Bar, …).
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?
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:
What version of photoshop are you using?
Help>System Info from within photoshop and the top line is the Photoshop Version.
I seem to remember a photoshop cc version that had that issue, maybe 2014 and an dot release update fixed it.
thanks but it's 2015 CC .
I don't think I've done any reset preferences...
I recommend you do.
But as mentioned previously make sure all your customised presets are stored so you don’t lose them.
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It's not updated with the latest dot release.
When you go to Help>System Info does it say Adobe Photoshop Version: 2015.1.2?
If not, use Help>Updates from within photoshop.
Also a good idea to reset the photoshop preferences as suggested by c.pfaffenbichler.