My latest zimbra installation is presenting a little issue with some users in the web client interface.

If they use the advanced version (ajax) the mail cant be redacted. The user cant wrote in the message content space. We try configuring the account redact the messages on html or plain text format, and the problem continue; But if the user access using the standard version (html), the message can be redacted without problem.

that only happen with some aleatory accounts. How can i search any clue to detect were can be the problem?

thanks and regards