Sacheverell

Right, I basically had to re-learn the entire game from scratch. Must've done something right though, because I finally put a station in orbit for the first time ever, even since beta! Has a lab, extra fuel, a bunch of crew space, and of course, docking. Thanks for the help, everyone.

Answering as many of these as possible: Yea, I was doing the ol' "10k then turn" routine, and realized after a bit of looking around that the old way isn't flying anymore (pardon the pun). TWR, honestly not sure, but given what I'm hearing, likely way too high. Will look into that! Center of mass is pretty much centered, but I'm betting this has more to do with the new atmos not being a lake anymore, and actually being atmos. Will do a few more tests with this, and see what I come up with. Thanks for the feedback!

Title summarizes the problem: I've built at least 7 different rocket designs - some from old templates that I know worked before, some brand new - and every single one of them has a massive stability issue. Right around 10k meters up from launch, the rocket will tumble end-over-end, no matter what I do, or change. I've checked everything I can think of: weight distribution, where thrust is actually being applied, RCS, no RCS, fins, no fins, solid boosters, liquid engines, every possible combo of thing I could think of. I did have ONE rocket that mostly flew stable, but I can't figure out why it does, or why all the others do not. At first I thought maybe the rockets I was building with the AI pilot were wonky (and they still may be), but even manually piloted rockets have this problem. Any ideas?

Rather a lot of interest, yes.

Definitely on-board with this suggestion.