so.......... ive got a wierd issue that i was directed here thru reading but after reading all 79 pages of this thread i cannot find it, maybe im just blind but can someone direct me or help me with this, I love the MK 4 space plane parts, but i also use OPT for different SSTO solutions, but i normally mesh both mods, for example ill use MK4 engines on OPT planes, and OPT wings one MK 4 planes, but as of late ive had a issue with OPT wings not working. There basically like the BIG S wings but with built in control surfaces..... makes it easier when im running mods that make procedual wings not work due to mods like FASA. the control surfaces just do not work. "Do you have MK4 spaceplane installed? That has a config that forces everything else to act as if FAR is installed. No idea why, there is a fix CFG somewhere in the MK4 thread. Not sure if that is your issue but it sounds exactly the same as the wing lift issue I had from installing Mk4 mod." If anyone knows about this config please let me know