Hi Mustang, right now I can but thank you a thousand times for the suggestion regarding the 707; now it flies without any single issue, after fixing the problem in the VC panel; I'm truly glad. it remains a mistery why the B-52, without any apparent problem during its flight (smooth etc.), causes the P3D unmanageable after its closing and reopening. I NEVER faced a similar problem; my OP is a normal W7 professional, I fly all the planes - even the ones from FSX, twicked if the case -. Absolutely weird.