Was there ever any resolution to this issue? We just turned up our second Infinity, both running 2.0.1 and it is exhibiting this behavior, as is our existing Infinity.
I can of course get the ui working by running /usr/sbin/ubnt-util but in a matter of minutes it quits again. Not having the traffic stats is a mild issue but what is worse is the interfaces all show "connected" by default, whether they are connected or not.