Plesk v8.3.0.1 Horde WebMail Password issue

[dboillot]

Hello, i'm unable to change passwords on any email account in Horde. when I do, I get the error message "Failure in changing password on poppassd server: Incorrect Password"
I've looked though the forum here and all I can find are posts on older versions, and newer versions, most say you need a patch to fix, but I'm unable to find one for 8.3.

can anyone help me fix this issue?

Thanks