I just installed Hummingbird a couple of minutes ago. The plugin was unsuccessful in running a Performance Report and rendered the following message:
"The performance test didn't return any results. This probably means you're on a local website (which we can't scan) or something went wrong trying to access WPMU DEV. Try again and if this error continues to appear please open a ticket with our support heroes."
Since I'm not on a local website, I'm coming to you for assistance. I've granted access to you through my WPMU Dev Dashboard.
I look forward to hearing from you soon.