Problem with proxy and write new messages

[modcube]

I've installed roundcube, and it all seems to work well, except when I click on write new message button, then the page reloads showing the inbox.

To solve the problem:
 - Connect directly without squid proxy or...
 - Change the url of the button from "/?_task=mail" to "/?_task=mail&_action=compose"

It happens with all browsers I've installed (Firefox, Safari, Chrome, Explorer)

The roundcube version is v0.2.2

SOLVED, It was a problem with database and only some users