I've been using iCal to sync with freetobook for a year successfully. This year, it's accurate through May 31, but it shows no availability for June 1 through October 19. After that date, it's accurate again. Freetobook hasn't found anything on their end.
Anyone know of a reason the iCal is wrong for that specific period of time, and more importantly, how to get them to sync correctly again?