When you have a K2 Role that contains an Active Directory group and you refresh the group, all user objects are removed from the group and thus not available in the K2 Role.
- Ensure you have K2 Five (5.2) installed.
- Download the K2 Five (5.2) FP22 from K2 Partner and Customer Portal.
- Install the K2 Five (5.2) FP22 to apply the fix.
- Refresh the browser cache.
If your K2 Role is in broken state where the user objects are removed, you need to edit the role and click the OK button.