This always happens to me when I first install an update for the 777, since about v1.3. After I reboot my computer, it rarely (if ever) happens again. By this I mean I had these problems with updating/installing v1.3 in FSX, v1.4 FSX/P3Dv2 and v1.5 in FSX/P3Dv2 in both Win7 and Win8.1! So that's a total of about 10 installs. In one of the earlier versions, it wouldn't happen all the time, only every now and then.