Unfortunately, there’s a version lock compatibility issue. UCSM 2.1.1 (and PE 2.1.1a) will only work with UCS Central 1.0. UCS Central 1.1(released just yesterday) will only work with UCSM 2.1.2 --- and the corresponding PE, when it becomes available. So for now, the only way to work with UCS Central 1.1 is going to be with physical domains, not emulators.
Please stand by as the new PE for 2.1.2 will be available shortly.
Thanks,
-Jeff