Sites such as Youtube, Twitch etc... Flicker when I go into full screen mode. What i mean by flicker is, the bottom 1/3 will flicker on the top of the streaming, e.g. The stream bar + the bottom part of the picture. Sometimes it will go crazy and flicker like mad, sometimes it will be a few times a minuet. Does anyone know why this is happening? Here are my iMac specs: 27" Graphics NVIDIA GeForce GTX 680MX 2048 MB 16 GB 1600 MHz DDR3 3.4 GHz Intel Core i7 Thank you for any help.