Hello, I have the exact same issue with last ugrade (4.4.1 -> 4.5) so if by any chance anyone has an idea... Or if Haru you have solved it I'm very much interested ! :) The real problem is that I can't even delete this panel in administration, because any WebPreferences page freezes (!!!), nothing is clickable and I just must close the tab... If logs can help I'll be delighted to provide what you may need. Thanks in advance -- View this message in context: http://xwiki.475771.n2.nabble.com/TRANSPORT-ERROR-with-no-error-message-in-… Sent from the XWiki- Users mailing list archive at Nabble.com. _______________________________________________ users mailing list users(a)xwiki.org http://lists.xwiki.org/mailman/listinfo/users