A case of Circuit Breaker Double IPA to help my complete brain freeze here please!  Can't fiddle through Friday fog to fix this formula (alliteration anyone?). Missing parentheses?

Case comment workflow:

IF( OR( AND( ISNEW(), CreatedBy.UserRole.Name = " Choice Community Users Partner User"), AND( ISCHANGED (LastModifiedBy.UserRole.Name)( LastModifiedBy.UserRole.Name = " Choice Community Users Partner User")), True, False)