Hi, having switched to P3D v3.4.22, and having purchased nearly all CS planes, the only one native FSX working 90% properly is the C-130 (some trouble with the exterior lights); the 707 is a FPS eater (of course some compatibility issue between FSX and P3D)  and both the 757 & 767 works very bad, so I left them in the hangar waiting for some update that, I fear, we simmers will get very late. My B-52 issue lies somewhere inside some parameter. While flying it (the first time I installed it), both the scenery and the plane are very smooth, reaching the 30 FPS I chose as frame limit. But as soon as I exit from P3D, I can't fly anymore if not "repairing" it after deleting even all the LM folders in the Users path ("Roaming" and "Local") . I simply copy all the folders inside the P3D root folder to an external one and re-copy them again to P3D; so the waste of time is some hour only, just to reinstall FTX Global, Vector, and a couple of planes and sceneries that need to be reinstalled again. Who knows what or where is or lies the darn trick  that causes this mess.