Error in CUP with SP12

Hello everyone

Last weekend we installed SP12 and now CUP won't let uscreate any new request because we keep getting the next message:

Correct the following errors:

Enter a valid value for "Manager"

We reviewed all the information and the configuration and everything looks the same as before, when it was working well. We noticed that if we leave the manager name and last name fields as optional, then we can create the request. However, we need those fields to be mandatory.

Does anyone know how to fix this?

Thanks in advanced!