The button is "Reset Sync History..."
Something glitched yesterday with iCal. I was adding a vCal entry that I got from email. It took a long time to add but finally completed. Now, today, I can't sync with my .Mac account. Looking at the .Mac pane from System Preferences, the Calendars checkbox just spins. I've left it for quite some time (half hour or more).
I tried the reset sync history. I may try that again because I then told it to "merge" the data with .Mac. I probably just need to push what is on my laptop to .Mac and not try to merge it.
But I have a basic problem between my portable home directory syncing and my iSync syncing. I'm not sure how to resolve all that.
But, for now, can someone point me to a log file or something that will help me diagnose this?
Thanks