the versioin of change password plugin is 3.1,the version of compatibility plugin is 2.0.16, the versioin of squirrelmail is 1.4.22 and poppassd version is 1.8.5. change password successful with 'telnet localhost 106', but login squirrelmail jump to options 'change password', there were hints when 'old password' was wrong or 'new password' were not matching, but all was right there was a blank page popping-up when i commit. i search in google and read the document squirrelmail,change password and compability still cant find the solution.

Hi,

A blank page in php means that there is some php error. Maybe it's a permissions error.
You should check the webserver logs to see if you find anything useful

Regards