Those errors seems to happen randomly and in the whole system. Sometimes when we click in a button, or even try to login, a alert comes up with the "Message cannot be parsed" error.
Funny thing is that when I turn on fiddler, the thing stars to function ok.
Sniffing the connection via smsniff i was able to capture the traffic of the bugged and working postbacks. The contents were suposed to be rendered in a update panel.
It appears that the "bugged" response is the whole page again, what would cause such a thing?
Sorry about the undetailed question, my first here.
Regards
EDIT: No one got any ideas about this bug?