I powered up the classic 150, and ran the local app. It found the 150, and looked like everything was great. I hit the 'x' in the upper right instead of minimizing it. When I turned it back on, the local app now says 'busy'. Any suggestions?
Try waiting a minute before re-starting the local app.
Are you entering the Classic's IP address manually or is the local app finding it on its own ??
i.e. "auto detect classics" is enabled
If still not working, try re-powering the classic and see if it comes back to life.
boB