"I fixed it by uninstalling the plugin, rebooting vCenter and reinstalling the plugin (reboot vCenter again). I did this twice (uninstall/reinstall/uninstall/reinstall) and rebooting vCenter after each step so I could document and open a SR, but it ended up working after that."
I'm having the same issue as Zach and the suggestion from elerium unfortunately did not have any affect.
I've had an SR opened since last week but they haven't made any headway yet.