After a MailScanner updates the following error was present:

Feb 25 14:50:14 server MailScanner: Process did not exit cleanly, returned 1 with signal 0

Previous to the update was a fresh install of MS in which it would start then immediately try to start again.

# /usr/mailscanner/bin/MailScanner --debug
In Debugging mode, not forking...
Trying to setlogsock(unix)
rules: failed to run CG_FUJI_JPG test, skipping:
(Can't locate object method "image_name_regex" via package "Mail::SpamAssassin::PerMsgStatus" at (eval 1607) line 1169.
)
rules: failed to run CG_DOUBLEDOT_GIF test, skipping:
(Can't locate object method "image_name_regex" via package "Mail::SpamAssassin::PerMsgStatus" at (eval 1607) line 1394.
)
rules: failed to run CG_SONY_JPG test, skipping:
(Can't locate object method "image_name_regex" via package "Mail::SpamAssassin::PerMsgStatus" at (eval 1607) line 2309.
)
rules: failed to run CG_CANON_JPG test, skipping:
(Can't locate object method "image_name_regex" via package "Mail::SpamAssassin::PerMsgStatus" at (eval 1607) line 3546.
)
LibClamAV Error: cli_loaddb(): No supported database files found in /usr/local/share/clamav
ClamAV Module ERROR:: Could not load databases from /usr/local/share/clamav at /usr/mailscanner/lib/MailScanner/SweepViruses.pm line 548

then upadte clamav from configserver config panel ( MailScanner panel )