I'm running RSS and BBT w/out RO. KSP is stalling for me, too. I get to the main menu but I see Kerbin in the background instead of Earth. Any menu selection from there locks the program. If I take out BBT everything is fine.
i7-4770K 3.5GHz 16 GM, 64 bit Windows 10. Plenty of memory left. All mods are fresh. RSSVE, Scatterer, Kopernicus, PlanetShine, TextureReplacer, KAS & KIS, Precise Maneuver, RCS BuildAid, SMURFF, DMagicOrbitalScience, ThroughTheEyes, TransferWindowPlanner, Wwwwwwww. No parts mods.
First forum submission but a long time reader. Love all the work you and the modding community do. Thanks for your help. It's a great mod I've gotten very used to using.