So i have had the ngx installed for a while now however recently i have been having problems such as the screen going black if i were for example check the flight analysis or go to settings or change the speed at which the simulator was running (from normal to 8 times faster) and ect. this is the only product in my simulator that does this and i have no clue what to do about it i have tried to uninstall, and reinstall the product i have even tried to uninstall and reinstall FSX. 

oh by the way the screen does not always go black some times i will just loose like 50% of the graphics airport terminals will be gone and maybe the VC will be see through that sort of thing.

please help im at my last straw with this product that i have paid so much for.

That's FSX related, not NGX. I used to have it, but then I started tweaking my GPU an CFG and played around with my sliders and now it's all good.