This is a product defect (TF00680706).
Steps to Recreate:
1. From the MMC, select any user account.
2. Go to Advanced Properties, Select 'Show all possible attributes' and 'Include attributes with empty values', and look for the dlMemRejectPerms .
3. Select dlMemRejectPerms then click on 'View/Edit'.
4. Click on 'Add' then click on the box with three dots to the right of 'Value' to enter in any account name.
5. The value should be populated now. Click OK once and then click OK again and an error is generated One or more values have incorrect format.
This has been resolved in Active Roles 7.0.4