If you're still having issues, try using a shorter cable for tethering. That solved my problem. I used the cable that came with the camera (maybe 3ft long) instead of my Tether Tools 15ft cable and that apparently was the issue. My husband (an engineer) said it was an issue with voltage drop because of the long cable most likely. I did buy the TetherBooster Pro from Tether Tools last night as well, so I'm hoping that will allow me to use the 15ft Tether Tools cord with no issues.