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That issue was fixed in 2011:
https://github.com/opendns/dynamicipupdate/commit/58eb721427f132900d81ee95acf3cb09ea133f59
r33138 | frank | 2011-06-30 17:26:25 -0700 (Jeu, 30 jui 2011) | 3 lines
Properly encode parameters in URIs.
Along with other bugs...
That was fixed 5 years ago.
Use the last version available here: https://f.00f/old/OpenDNS/updater.dmg
This is the version whose source code is in the OpenDNS Github repository, and that bug was one of the first things that got fixed.
Using the IP updater or the authentication mechanisms on the FamilyShield IPs is not useless.
Connecting to the FamilyShield IPs *adds* blocked categories to the ones that were already blocked.
So if you are blocking the Alcohol category on your IP, ...