The attachment I tried to post was from my pc so I still have it. The error was:
"HTTP Error 500 (Internal Server Error). An unexpected condition was encountered while the server was attempting to fulfill the request."
This was using chrome. The post did go up but you had to open another tab and start from opening NSC back up again. Refreshing the tab the error occurred in didn't seem to help.
I suspect it was an issue with the hosts which has since been resolved, and there was nothing I would have been able to do.