Hello, I have 2 new server running with cpanel. One is PHP5.1.6 and one PHP4.4.4. An I get the same errors on both: What I find out is that once you start an session with one user (one website) and browse other website on the same server you get this error. The session php try to write is the same used for previous user and is own by previous user. Once you close the browser window and the session is destroyed the error is gone till browse other website on the same server. Thanks.