Grabcad Print ERROR: FDM Build Service has terminated unexpectedly

When starting GrabCad, I get the message "FDM Build Service has terminated unexpectedly." Further, I cannot start any prints, receiving the message "Cannot start FDM Build Service"
Everything was working fine several weeks ago, not sure what changed.
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I finally made some progress on this error. Oddly enough, I was investigating an issue with python's tkinter library and narrowed it down to environmental variables causing trouble. Out of curiosity, I unset the same values and tried GrabCad and BAM, error gone! To fix the error, I have to unset the following (which were set for a cygwin setup):
set "HOME="
set "HOMEDRIVE="
set "HOMEPATH="
set "USERPROFILE="