It seems like this bug may be most common with longer planes (not sure if ratio to width, or absolute size). Also, it happens most frequently (about half the time, or more) when using the tech replacement type of loading in Creative or R&D. In these modes any shape plane seems to be prone to this glitch (even the smallest I tested). However, it can happen in campaign, with regular tech loading. Pitch axis appears to be 10-15 degrees offset to the right or left (I'm always just pitching or just rolling, except where I loose control): Video, clip 1 (Campaign) - OK, mildly broken, OK. Clip 2 (Creative) - OK, broken, broken. I'm surprised this hasn't been reported more (it seems to happen quite a lot, but probably most players don't know if they've just built the plane wrong - I thought so, at first). I mean, I think this is what was reported here in this thread by @Seth_Seth (and probably this thread by @Soviet_Samuelson too, in that case). However, there were confounding issues that confused the discussion there and it definitely does not seem to be limited to a particular wing type. Also, I'm not sure that @kae's assessment captured the whole issue... So I made this new thread, to be clear - I can't see a distinguishing factor as simple as that as when this bug occurs, after testing it quite extensively. Even if the replaced tech is in build beam, anchored, or just totally flat on the deck on all wheels, sometimes it will load OK, and other times it won't. I'm imagining the bug *might* even transmit between techs, like with the animation glitch on scrapper blocks, (totally speculative). I've attached some of my test planes.