I too, have narrowed that exact error to this mod. I have an assortment of mods but this kept happening every time this mod is present. I ain't no modder so I can't of course say if this ain't an incompatibility of this mod with another mod, but here goes my attempt at debugging. Method of testing: Remove mods, start a new career game. 32bit KSP. Straight to VAB, take the Command Pod Mk1 and straight to the launch pad. Step out with Jeb, walk a few feet, take surface sample and EVA report, walk back to the pod and board. Then attempt to return to the VAB or Space Center via the buttons above the altimeter. Error: When attempting to Retrieve Vessel or return to space center through the buttons above the altimeter the resource overview and IVA/EVA pictures and buttons vanish. I am not returned to the VAB nor the Space Center and can't do so even through the ESC-menu at this point. Buttons do click but don't do anything, game doesn't freeze or crash. Only way out of it is ALT+F4. ALT+F12 debug window reports an [Exception]:Nullreference. Output_log.txt from a fresh install of 32bit KSP with only Resource Overview installed: https://www.dropbox.com/s/4ubaksuxkg6qfeb/output_log.txt?dl=0 Hope this helps.