After my latest web rollout, I'm unable to sync from our staging server. The most likely culprit was turning on the Output Filter (previously I handled my own fixing of the form actions).

When syncing I now get "Response is not well-formed XML."

However, if I pull up the SyncServer.asmx url on the live site in a browser on the staging site everything looks normal.

Version: 1.7.2091
Edition: Professional