Ermining worked fine for me until today (minus some funny mishandling of daylight saving -- some of my local appointments were shifted by one hour). Today I recreated some of my appointments on Google (I mistakently thought they were shifted, but it turns out I forgot to reset my TZ after vacationing), and now Erminig would use up all available memory when trying to retrieve Google events from that calendar. This is a calendar I accessed in GC from another Google account that I also own (so AccountA:Calendar1 is actually AccountB:Calendar1).

Other calendars under AccountA still work, but I have these two overlapping events on the same calendar, and the later event got shifted to the next day.