I have found that one of the Google calendars I was subscribing to (my school district's religious holiday calendar) had some type of error in it. This caused me to not have any calendar data at all on my Pre. I know that if I turn that calendar off and re-sync calendars my problem goes away. I also know that if you have this Google problem DO NOT use WebOS Doc because your Pre will go black and not turn on. I also know to not try and create events if they already exist somewhere. When I got my replacement Pre (1st one never turned on again after WebOS Doc

) I was deleting hundreds of events that were appearing multiple times all over my calendar. I have not turned the problem calendar back on and have transferred the dates from that calendar manually to my Pre. I have spent a lot of time dealing with this problem and I am so upset to know that it is caused by Google and could happen again!