Just tried to set up a USB tether for the first time, found that the IP address displayed on the app was not the correct IP address for the link. I had to open the command prompt on my PC and find the actual IP address of the gateway (my phone) before I could connect to AirDroid. I'm not sure where AirDroid got that IP address from, as it's not even in the same subset, let alone class, of the IP address my phone actually had.