In order to resolve this you will need to update the Task Level User Defined Field with the missing users names. Steps are as follows:-
1. Log into Replicon as Administrator. 2. Go to Administration > Users/Departments > User Defined Fields. 3. Go to the Task Tab. 4. Click on 'Project Manager'. 5. Type the name of the Users in the 'Options' section and click on Add as shown in the screenshot below:-
6. Click on Save.
You can now go back to that task and update the project managers name.