I just encountered an error with KCT. When I started the game and loaded my save, I got the following popup: ERROR! An error occurred while loading KCT data. Things will be seriously broken! Please report this error to the KCT forum thread and attach the log file. The game will be UNPLAYABLE in this state! I noted that the KCT button didn't show up in the toolbar, and all alerts at Kerbal Alarm Clock were missing. I did not explore any further for fear of breaking my save. I have no idea what could be causing this. The game worked earlier today, and I have not made any modifications to it since then. The game did crash once when I was last playing: I was dropped onto the desktop at the last stages of landing a vessel on Kerbin. At the time I restarted the game, loaded a save where the vessel was still above the atmosphere, and everything worked fine. I don't know if that's related to the current problem. The output log is here: https://www.dropbox.com/s/6zb33hcb3bael37/output_log.txt?dl=0. I didn't find the Debug Messages setting mentioned in the original post, though; is that advice obsolete or am I just being blind? If you need any more information, please ask.