I am running into the exact same issue as SoliDTX since the halloween update.
gecDebug.log looks like this:
ERROR:root:gecException:
Traceback (most recent call last):
File "GilansEncounterCounter.py", line 1294, in run_app
File "GilansEncounterCounter.py", line 300, in refresh_font_info
File "GilansEncounterCounter.py", line 135, in refresh_gui_info
KeyError: 'is_primary'