Hey, I just encountered the same problem. I've uploaded my save and log here : http://www./download/jwi2jqjgguc9hu1/KPS.90_UnresponsiveBug_Save%26Log.rar How the problem occured : I accepted a contract : Test Basic Jet Engine landed at Kerbin I tried that one multiple times, created a small ship with the prototype Jet Engine, activated the engine through staging, nothing happened -> No air intake on my ship, the engine can't work without it. Did that a couple times to be sure. I went back to the Mission Center and cancelled the mission (couldn't do it, haven't researched air intakes yet ). By clicking "Back" in the top right corner, I was in a weird "in between scenes" state, where I have both the Space Center's and the Contracts Building's UIs at the same time . Can't do anything other than Alt+F4. By exiting & reloading the save the problem persists. Seeing Jattenalle's post, I tried deleting all missions, to no avail. "Perform Visual Surveys of Kerbin" missions keep poping up, and I believe they are part of this new update. Maybe that's the faulty one. I don't know... Anyway, I hope this helps, maybe you can find the faulty mission by looking at both our saves. I'll try to start a new carrer later this week and keep you updated if I can reproduce it on a new save.
