Odd X-Spam-Status

About three times a week, I get a flurry of emails from open relays that 
bypass my spam filters. The problem resides in the fact that SpamAssassin 
chokes on the email. Instead of the normal scoring that I get from SA, I 
get:
X-Spam-Status: No, hits=? required=?

I am running SA 3.1.0. Is this a known problem in the older version? Is it 
worth the time/effort to upgrade to 3.1.4 to resolve this issue?

Here are the full headers of the message that causes the problem:
Return-Path: <[email protected]>
Delivered-To: [email protected]
Received: (qmail 19952 invoked by uid 527); 15 Aug 2006 21:53:23 -0000
Received: from 71.102.69.179 by kilnar (envelope-from 
<[email protected]>, uid 504) with qmail-scanner-1.25
  (spamassassin: 3.1.0.
  Clear:RC:0(71.102.69.179):SA:0(?/?):.
  Processed in 478.872604 secs); 15 Aug 2006 21:53:23 -0000
X-Spam-Status: No, hits=? required=?
Received: from pool-71-102-69-179.plspca.dsl-w.verizon.net (HELO 
CARLOS-LAPTOP) (71.102.69.179)
   by 0 with SMTP; 15 Aug 2006 21:45:24 -0000
Message-ID: <93109277782565.27092E149F@YXUTT11C>
From: "Clayton Griggs" <[email protected]>
To: <[email protected]>
Subject: shame of sex? we can change it
Date: Tue, 15 Aug 2006 16:19:30 -0700
MIME-Version: 1.0
X-Mailer: Microsoft Office Outlook, Build 11.0.5510
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106
Thread-Index: ceF8uz4YRuNtzO3viECNeIBRMfm0IGqK6eVB
Content-Type: text/plain;
         charset="Windows-1252"
Content-Transfer-Encoding: 7bit


The body of the email contains nothing strange that I think would cause 
this problem.

-- 
John Evans
Administrator of kilnar.com

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