Not sure if this is the right place to make bug reports, but I just had an odd experience trying to get the engineer plugin to work in career mode. The parts were visible but unusable in the assembly building, and I was told to go buy em from the R&D department. Purchasing them didn't make the parts useable, and going back into the R&D dept showed that the original 3 engineer parts I'd purchased were still there, but *another* 3 had appeared that needed to be purchased. This repeated a couple of times, and occurred in new career mode games. I'm not the only person to have spotted this, but I didn't turn up any solutions. I eventually blew away my KSP install including all plugins and saves and what have you, did a fresh install with the engineer as the only plugin, and the parts were immediately available in career mode, without needing to be purchased. So that's nice. Seems like there's some conflict with pre-.22 parts or game state.