Problem with up2date after upgrade

  We have a beta environment, running current-1.0.6-1 and hosting a channel
for redhat 7.1.  I've upgraded from up2date-2.7.61-7.x.1 to
up2date-2.8.39-1.7.1 on the servers subscribing to the 7.1 channel, and have
started getting the following messages:

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From the local box:
[root@betaminidb1 /root]# up2date -l

Fetching package list for channel: redhat-i386-7.1...
########################################

Fetching Obsoletes list for channel: redhat-i386-7.1...
There was a fatal error communicating with the server.  The message was:
400: "Function getObsoletes not recognized" while attempting to get 
$RHN/redhat-i386-7.1/getObsoletes/2002102818154
[root@betaminidb1 /root]# 

From /var/log/current.log on the current server:  (repeats several times)
Oct 30 15:34:56 ERROR: New function called: module up2date, function
getObsoletes
Oct 30 15:34:56   params were: [{'client_address': ('127.0.0.1', 45957),
  'command': 'GET',
  'headers': <mimetools.Message instance at 81e5b50>,
  'path':
'https://10.2.2.200:8091/XMLRPC/$RHN/redhat-i386-7.1/getObsoletes/2002102818
1546',
  'version': ''},
 'redhat-i386-7.1',
 '20021028181546']
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Any ideas on this?  Will most likely try downgrading to the former up2date
version after posting this, just curious if anyone else has seen this kind
of problem before.  Thanks!

-Mike