Most employers know by now how to deal with employees who break the rules or don’t meet performance standards. It is not so apparent what should be done in the case of an employee with unusual personality traits or other qualities that cause the employee to be incompatible in the working environment.
SENIOR STAFF AND FIXED-TERM CONTRACTS: A Warning for Employers
Fixed-term contracts can create unexpected risks for employers, particularly where senior staff and contract renewal are involved. What should employers consider before relying on the contract’s expiry?

Interesting article Jan. But can this be grounds to not promote an employee?
Reply to Rue: It depends on the role to which the employee could possibly be promoted – an employee could be a misfit in one environment but have the potential to thrive in another.