Thank you very much for that info. It's a very sporadic glitch our devs have received a few reports about, so they're still troubleshooting and collecting info on what might be causing it. I've submitted your case to their queue for further review, and with the information you've provided, as well as my own troubleshooting. If and when they have an update regarding it, they'll notify you directly. At this time, since there's not much info to go off of, just based on reports, there isn't an ETA on a resolution.   In the meantime, they're suggesting using the regular list view to copy particular social posts (or other campaigns), if that error occurs for one in the calendar view. ... View more