Well, Mac user here. So now that I can actually get a console to my VMs I can finally start using the web interface. (Using the vCenter appliance)
Finding that the interface isn't as reliable as I'd expect. As part of my migration to 5.5 I'd shutdown a VM or two. Now it comes time to turn it back on, I go and select the VM and choose to Power On. The mouse cursor changes to the clock, but the VM does nothing. Relaunched the browser to try on a fresh session, still no luck. Went back to the full client, clicked on the VM, and powered it up with no problems.
This seems to be a really normal operation, what could possibly be causing the web interface to not be able to _start_ a VM?!