I thought The reason was the ModuleManager but it still crashes
KSP keeps crashing on me when I change scene (ie. Recover Vessel, Open VAB, Revert to launch, eta.) I've tried removing some mods, all but kerbal Engineer and Docking port aligner and The Expansion, but didn't really help all that much. The only mod that I removed that made a difference was Scatterer.
The mods that are installed at the moment are,
-Chatterer
-StockVisualEnhanments
-KerbalEngineer
-Docking Port Aligner
- Stockalike Station Parts
-Squad Expansion
-TextureReplacer
-Tweak Scale
The game isn't COMPLETLY Unplayable but it gets really annoying really fast.