==== Required information ====
- iRedMail version: iRedMail-0.8.3
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): iRedAdmin-Pro-MySQL 1.5.1
- Linux/BSD distribution name and version: Centos 6.4
- Related log if you're reporting an issue:
====

After an yum update ClamAV is failing with a permission denied error:

Mar 22 14:59:07 tribun amavis[2290]: (02290-01) (!)run_av (ClamAV-clamd) FAILED - unexpected , output="/var/spool/amavisd/tmp/amavis-20130322T145907-02290-wVQaUdd8/parts: lstat() failed: Permission denied. ERROR\n"
Mar 22 14:59:07 tribun amavis[2290]: (02290-01) (!)ClamAV-clamd av-scanner FAILED: CODE(0x37a51a8) unexpected , output="/var/spool/amavisd/tmp/amavis-20130322T145907-02290-wVQaUdd8/parts: lstat() failed: Permission denied. ERROR\n" at (eval 115) line 897.
Mar 22 14:59:07 tribun amavis[2290]: (02290-01) (!)WARN: all primary virus scanners failed, considering backups

1. The config files for clamd and amavisd are still the old ones
2. Both daemons still run under the same users as before the update
3. Permissions on /var/spool/amavisd/ and subsequent dirs are still amavis.amavis
4. User clamav is still in the amavis group
5. A manual scan works well on a directory that failed in the maillog:
    clamscan -r -l scan.log tmp/
    tmp/amavis-20130322T145907-02290-wVQaUdd8/email.txt: OK

What am i missing? Any hint is welcome.

Regards

Michael