"Unexpected server behavior" error occurs when you open Web Presence Builder 11.0.
The following error is shown in the log (
2013-07-26T17:21:03+02:00 [EMERG] [System] /JsonApi/ SB_Facade_Exception: Unable to query the server disqus
Discuss account has been disabled/removed at Discuss side. But the reference to disabled account remain in Web Presence Builder.
The issue has been confirmed as a product bug in Web Presence Builder version 11.x with ID #117541. It was fixed in 11.5 release.
For Web Presence Builder 11.1 the issue should be fixed manually via modifying the WPB database.
Since the issue requires complex manipulations with the WPB database, it is recommended to contact Odin Technical Support for assistance.