An error similar to the following may occur when trying to register a GPO or an OU:
"Quest.Avalanche.Exceptions.AvalancheException: Error backing up object. ---> System.Xml.XmlException: '', hexadecimal value 0x1F, is an invalid character. Line 3, position 15"
This error usually occurs due to an issue with the Live GPO or with the GPOs linked to the OU.
Run GPMC using the GPOAdmin service account and try to backup the GPO. If you get an error trying to backup, there is an issue with the GPO. Deleting and recreating the GPO will most likely resolve the issue.