In speaking with my IT Department, I've learned that they have been having problems with our network after a recently installed update.
We discovered that updating Acrobat for PDF Shared Review users (selecting Help >> Check for Updates... and install the updates, then reboot) fixes the new comments not posting problem. I checked for the XML files as Lief suggested, and found them. My IT department is looking at backups from the past few days to see if they can find XML files that contain the "lost" comments. Thanks! Richard
