MailScanner not detecting Trog/Agent-IBF - assistance needed.

[Erik Bloodaxe]

Can anyone assist with a problem with my MailScanner/Sophos set up:

E-mails with a zip file are getting through mail scanner with zip files
containing Trog-Agent-IBF.  The Sophos on the mail system will detect
that a zip file infected with Trog/Agent-IBF.  Other viruses are being
detected and removed by MailScanner and sophos.

Debugging only says that

In Debugging mode, not forking...
Queues are "/home/exim/spool/port.26/input"
Ignore errors about failing to find EOCD signature
format error: can't find EOCD signature
at /opt/MailScanner/bin/MailScanner line 820
format error: can't find EOCD signature
at /opt/MailScanner/bin/MailScanner line 820
Stopping now as you are debugging me.

The messages are moved from the incomming queue to the outgoing one,
but, the virus infected zip file is still there and there are no
mailscanner headers added.

CAn any one assist?

Erik