All of a sudden, when someone sends me an invitation for an event in Google Calendar, and I accept that event, it always shows up later as not accepted and awaiting my response. Then I click accept and it does the same thing. Meanwhile, the person who sent the invite gets a notification every time I click it, so it is annoying to both of us!! Note, that when I accept, it stays accepted for a while (maybe overnight) and then when I look at my calendar the next day, boom.....unaccepted. Thoughts?