So I was one of the people who actually had success with the first sync.
However, DM can't seem to remember any of my sync preferences.
For example, when I plug in the BB and re-open DM, it forgets which Calendars I'd like to sync, and doesn't even "remember" that it's also supposed to sync tasks/contacts/calendars. I have to re-enable it each time.
i had the same issue on my work computer. will try trashing the prefs file and see what happens. otherwise, it's a big pain to reset the app every time you sync and backup!