Created attachment 102980 [details]
During and after drawing anything to the canvas remains clean. Changes are only visible after clicking on another layer in the layers window
OS Windows 8.1 x64
Intel B980 (2.4 Ghz)
That's a known issue with some versions of the Intel display driver. It's the driver that's buggy, not Krita, and unfortunately we don't have access to hardware that shows the problem so we cannot find a workaround. For now, you'll have to disable opengl in Setting/Configure Krita/Display.
Please tell us exactly which brand and model of system you have, and which version of display chip and display driver you have. For the driver version, press the Windows key, then type "Device Manager", open the Device manager application and check the Display Adapter dialog.
*** This bug has been marked as a duplicate of bug 360601 ***