My scheduled Activities including critical calendar dates disappear intermittently ever since I began using ACT! 2010. This happens on both Win 7 and XP computers. They show on calendar display but not on Activities. If I reselect users they will reappear but it is always set to all users. Please fix this. It appears to be a CRITICAL BUG. I have seen a thread with over 1000 views so this appears to be a pervasive problem.