Strange display problems

For some reason i am experiencing strange problems using the LDS 767 with fs passengers or any pop up boxes, for instance if i dispaly fs passengers mini report on screen i can't pop up the fmc, also if i run fs passengers hidden if i click on the airspped knob on the mcp the fmc pops up and at times during a flight the panel seems to revert back to various stages in the flight and then flicks back to the current view. Has anyone experienced strange issues like this, i'm running the 6800gt pci express, i'm not sure if AA settings are related to this? i'm running some tests but non seem conclusive so far.Paul.