Are you leaving the API Key blank? Mine is blank and it works without one. I just typed in a bogus one to see what happens and what error it would give, and it says "Error connecting to wunderground. Check your internet connection / station ID" in red.
actually correction (sorry), i first installed B iris, i chose import/restore settings... everything looked as was. (and function(ed)s as should - it does show Temp/Hum.. but no value.. which i assume is due to BIT not being able to connect,. then installed BIT... re did options/station Id from prior/working screencaps. And now i'm here 2day
possible something messed up from B iris import settings?