As mentioned, you might want to check your atlassian-confluence.log which is located in <Conf_HOME_Dir>/logs/ in order to further investigate this issue.
If you are running on MySQL server database, most likely the cause of the issue is due Max Allowed Packet configuration which is discussed on our knowledge base article here:
Hope it helps.
I'm Gliffy Technical Support. Could you please open a ticket at http://support.gliffy.com? I'd like to ask you for a copy of your current log file.
PO Box 7775 #35255
San Francisco, CA, 94120-7775
Thanks for signing up for Jira Ops! I’m Matt Ryall, leader for the Jira Ops product team at Atlassian. Since this is a brand new product, we’ll be delivering improvements quickly and sharing updates...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG