I'm trying to install another rom on my Samsung Galaxy S3 and when in the Clockwork Recovery Mode, the ADB quits recognizing the phone. When I boot to the SO, the pc normally recognizes it, I gave authorization, I have usb debugging on. When I boot into recovery mode, it quits recognizing, thus not letting me upload the rom.
I had similar situation with Xiaomi Mi3 W. It was totally working while in OS, but not recognized by ADB when in recovery (CWM). In this particular case it was driver problem. When phone was working normally, it identified itself as MTP device, so Windows had neccessary drivers already installed. But when in recovery mode, it isn't neither MTP nor USB-flash device.
Check Windows Device Manager, it should show some unidentified device (with yellow question mark). If so, right-click it and choose "Update driver", then install standard ADB generic drivers provided by Google (they are labeled "Composite ADB Interface" or "ADB interface" or something like that). Then reconnect the device and see, if
adb devices shows anything. It should now display your phone id and say it's in "recovery" state.