I came here looking for others having the same problem. I don't know TTTA's configuration, but I am having that same issue. I added the KA-100 Detection Array and went to launch. On the pad, framerate dropped to 1 (according to FRAPS) and the game was unusable. I went back to the VAB and removed only that part and re-launched without issue. I tried it by only adding a OCTO2 and the KA-100. Result, bad framerate. OCTO2 alone, no issues. I am not using KSPI as far as I know, I don't think it was bundled with other I am not 100% sure what you mean by nesting the GameData folder, but the directory path is E:\Steam Library\SteamApps\common\Kerbal Space Program\GameData\UmbraSpaceIndustries I love the mod and am not complaining, but if I can help you diagnose this for others I'd be happy to try. I'm a bit new though so forgive me if I'm missing something obvious to veterans.