Just purchased the PMDG DC6 a week ago and up till today no problems except understanding GPS and VOR. Today while flying I noticed that the ICON that show's the different task icons, started to fade away. After it disappear it could not be brought up with mouse button. Then the screen started to turn dark, except the bottom icons did not. When I clicked the "A" or S" key, the plane would flicker, then go dark. The only that would not fade away was the GPS, I have two monitors and I move it from one to another and it stayed the same, this has happen twice. Rebooted FSX, system and worked OK until 30 minutes into the flight. Any help would be appreciated.