Hi, FMD. Caroline is out so I’m helping out here.
The EA licenses limit the number of imports. If you have the 100 limit and import from 100 different Facebook URLs, each once per day, and no other imports setup (Meetup, iCal, etc) you would be at the max.
However, if you have 100 Facebook URLs scheduled to import every hour, that would be 100 x 24 = 2,400 scheduled imports per day, far over the 100 limit.
It sounds like this could be your issue, since you said things work when you have a low number of Facebook URLs.
Please let me know if you think this could be the issue here.
Thanks.