RBL checks broken in 4.56.8?

[TCIS List Acct]

I just switched from 4.55.9 to 4.56.8 and my RBL checks (MailScanner's RBL 
checks) are broken.  SA's checks still work fine.  Net::DNS 0.59 is installed 
and working.  Simply switching back to 4.55.9 on the same box fixes the problem.
spam.lists.conf is valid for the two I am using (spamcop and SBL+XBL).  No 
errors show in debug mode.

Ideas?

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Mike Bacher / listacct at tulsaconnect.com
TCIS - TulsaConnect Internet Services
http://www.tulsaconnect.com
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