We have a user running Zimbra Desktop (1.0 Build 1537) and periodically his calendar goes blank. That is, all the appointments just disappear. He has to exit the application and restart it before the calendar populates with all his appointments again. There are no issues with network connectivity as far as we can tell -- his email works fine at the time the problem happens. It's just as if the Calendar connection stops working.
As far as what precedes the problem, he says it's usually when he's looking at the Work Week view of his calendar. He scrolls a few weeks into the future and then when he scrolls back to the current week, the calendar is blank. The problem isn't reproducible on demand though -- it's just sporadic.
What could be the cause of this? Any ideas for a solution other than exiting and restarting YZD?