I can't build a rocket as well as a spaceplane because I can't attach two parts together. Also the part build sound of the first part is missing. And if I launch a one-part spacecraft like a Command Pod Mk1, it's immediately "moving" for a short time with first increasing and then decreasing speed with a maximum at about 70 m/s whitout changing position and focusing at nothing in the air above the launch pad. Once it reaches 0 m/s the focus slowly slides down to focus the Command Pod Mk1 I was using. After that everything else of the launch worked e.g. Crew Report or EVA. But I couldn't try engines, cause I could not attach them. I am using Play Linux whitch is based on Ubuntu, my system is up to date (I have made just today an update) and I am using the Steam-Version. The error is 64bit and 32bit. I also tried to reinstall the game completely. I have yesterday visited the IRC Chat and asked for some help. Thanks to bigbadaboom and Sub_Genius I was able to solve the Problem: I had to use the Launch-Option LC_ALL=C %command%_64 that everything workes, but every save was corruptet. Of course there was no long played save without an copy.