Yes thats correct.Mine was changing it back to default C from the chosen D. I have also recently had a CTD and after that it was originally also going back to C. But now,fow whatever reason, its sticking with D.
I used both methods, userconfig and Library option,to choose D. I guess im saying only stopping fiddling with the Library option and browse button has been the change i made that has - so far ! - stopped the problem.
Of course, this might not be the cause.