Spam but no randomly no Spam Report

[Gary Faith]

Running MailScanner 4.75.11 on SLES 10 SP2 X86_64.  When viewing the information via MailWatch, I see the following on the details page:
 
SpamAssassin
Spam: Y   Action(s): store, deliver, header, "X-Spam-Status:, Yes"
High Scoring Spam: N 
SpamAssassin Spam: N 
Listed in RBL: N 
Spam Whitelisted: N 
Spam Blacklisted: N 
SpamAssassin Autolearn: N 
SpamAssassin Score:1.66
 
The problem is Spam Report is blank.  This happens on a few seemingly random messages while most have something in the spamreport field.  I have verified this in the database that it definitely null.  Any reason why all the data except the spam report would be logged to mysql?  Could this be a spamassassin timeout problem?
 
Thanks,

Gary Faith
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.mailscanner.info/pipermail/mailscanner/attachments/20090625/466a8fa1/attachment.html