So, this problem arose after (and I thought as a result of) downloading 3 new mods, Station Science Continued, Salyut Stations and Stoackalike Station Parts Expanded, a few weeks back. I first tried to uninstall and reinstall KER, to no avail. Next, I uninstalled all 3 of those mods and the problem remained, both while they were uninstalled and after reinstalling them and again reinstalling KER, on the same start up. Does anyone have any suggestions?