Hey, folks. I'm wondering if someone might be able to help me out here. I am using a flashed Mac Pro with a GTX 680 2gb Mac Edition (with Yosemite). I had been using a pair of Dell S2240Ms connected via DVI with no issues but switched to an LG 34UM95-P ultrawide (3440x1440) I bought over the holidays. It is connected via DP because HDMI only supports 3840x2160 at 30Hz or 4096x2160 at 24Hz whereas DP supports 4096x2160 at 60Hz. However, since switching displays, I've found that when the Mac Pro wakes from sleep, it often shows just the pointer arrow against a black screen. The arrow seems to respond to items that are on the invisible desktop, switching between arrow and cursor as a I drag the mouse around. The only way I can get it to display the desktop again is by unplugging the DP cable and plugging it in again. There have also been 2 or 3 moments where the screen flickers/goes black for a split second while I am using it. Any idea what the issue might be?