In the interim to fix the issue you must edit the cupsd.conf file and comment out a few lines so that you have the following:
<Location /admin>
# AuthType BasicDigest
# AuthClass Group
# AuthGroupName sys
Order Deny,Allow
Deny From All
Allow From 127.0.0.1
</Location>
This creates a bit of a security risk as anyone on the localhost can make printer administration changes but in a small network this is not such a huge deal (when compared to the loss of functionality if the settings are in place).