teisco wrote on Jul 21^st, 2015 at 2:49pm:

Well I really wanted this 707 and downloaded the demo version and I also have the black line in the cockpit. I am afraid to buy the full version if, as I am learning here, they have not fixed it yet. My computer is not the problem. I7 at 4.4, Three Gtx 980's in SLI at 4 ram each. Nothing gives me a problem graphically in FSX except the 707. So fix it so I can give you money,  ok!

My computer is less powerful than yours, and when I get this problem with the 707, which isn't very often, I just reload the 707 and it disappears. The only time I don't reload the 707, is when it happens at the end of a flight!