Can not download Attachments

[trapper1204]

User logs in. Ok
User can read email. Ok
User clicks on attachment. Error

RoundCube Error in Browser

Roundcube SERVICE CURRENTLY NOT AVAILABLE! Error 500

Error Log

 PHP Error: Unable to get/display message part. IMAP connection error in /usr/share/roundcubemail/program/steps/mail/get.inc on line 53 (GET /email/?_task=mail&_framed=1&_action=get&_mbox=INBOX&_uid=39752&_part=2&_download=1&_redirected=1)


So far this is only affecting a single user, so i doubt its directly related to the upgrade, however, I am unsure were to look next.