I figured I would post this here before opening a ticket.
VMware 5.5 u1
VIN 188.8.131.52 Build 1901376
We can't seem to create any user defined service definitions.
When we attempt to create a user defined service definition the interface just spins and sits at 0% until we select Cancel.
All other VIN functionality seems to be fine.
Try restarting the vCenter. I helped with the removal of user defined service definitions.