I've been testing tether for the Motorola Droid for about a month now, Since I first downloaded the "new" tether for my PC, I can only use tether once without having to reinstall on my PC. I can log in a second or third time but I only send data, I don't receive any data.
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Select your Smartphone
On your PC while holding the Windows key on the keyboard and press the 'R' key. This will open a Run dialog, in this dialog type without quotes 'services.msc' and hit Enter. This will open the Windows Services window, look in this list and tell us do you have a single TetherBerry service or multiple services with Tether in the name?