Sebastian Krzykwoski
Comments
Try to change the version of Minecraft into 1.8.
Something similar happend to me only I was able to cause it by my-self. https://bugs.mojang.com/browse/MC-98621.
Did you try to relaunch minecraft btw?
It should fix it and then relaunch in 1.9 and no more of that flashing should occur, but to be honest it could come back.