This is a CentOS 5 server running Plesk 8.3, with the atomic qmailscanner, et al.
Here's what my log is firing out:
Tue, 18 Mar 2008 16:35:14 CDT

------ Process 3727 finished. Total of 0.016835 secs
Tue, 18 Mar 2008 16:35:17 CDT

+++ starting debugging for process 3780 (ppid=3772) by uid=2020
Tue, 18 Mar 2008 16:35:17 CDT

w_c: Total time between DATA command and "." was 0.000175 secs
Tue, 18 Mar 2008 16:35:17 CDT

w_c: elapsed time from start 0.000113 secs
Tue, 18 Mar 2008 16:35:17 CDT

g_e_h: return-path='
GMC@email.gmc.bfi0.com', recips='
aaron@theinstallgroup.com'
Tue, 18 Mar 2008 16:35:17 CDT

from='The Professionals at GMC <
GMC@email.gmc.bfi0.com>', subj='Your GMC: Monthly Update', via SMTP from 216.33.63.75
Tue, 18 Mar 2008 16:35:17 CDT

s_p_d: /var/spool/qscan/settings_per_domain.db doesn't exist falling to installed scanners
Tue, 18 Mar 2008 16:35:17 CDT

error_condition: X-Qmail-Scanner-2.01st: clamdscan: corrupt or unknown clamd scanner error or memory/resource/perms problem - exit status 512/2
There's obviously something wrong.
Any suggestions?