You never know, but I would be surprised if it really was something like that, because I've collected quite some plugins right now and every one of them saves their stuff just fine. Also, I'm no Linux expert, but I couldn't think about anything that might be wrong with my file permissions in that case. I'd really be glad to help find the issue if I can, because with my somewhat weak machine I'd benefit greatly from welding some stuff. If you need some logfile or want me to join IRC or anything, I'd have some minutes to spare right now! Edit: Okay, it's got to be something with Linux at least, because I put a Windows KSP install onto the very same SSD partition and ran it from inside Windows using a copy of the exact same GameData folder I used for Linux. I guess I could weld stuff and then copy it back to the Linux install, at least.