I'm having some issues with your OPT space plane parts. The I-J connector and J-Fueltank 4m Has no fuel nor Oxidizer in them. The OPT Landing gear, both med and small, Do not react to the landgear control nor have manual control. The J-inline docking and Utility Bay, and the J- Experimental Drop Bay doesn't have any controls. I'm at a lose because It sounds like it works for everyone else but not even the latest update seems to fix anything.