I had a Android studio 1.4(mac os) and was working on my USB device connected. It was working fine for many days. But i downloaded a project which was done in Android 1.5 preview version and imported a project. Gradle asked me to sync to latest version of grade and i did sync. After that i am not able see my USB devices in device list. USB debugging is still on in devices, i rebooted Android studio, mac and tried. Still same result. I toggled USB device mode, tools -> Android -> Enable ADB. I am exhausted. I am not sure if this issue is anything related to grade sync, but problem is issue started for me after the sync.
Pls help
EDIT: sudo ./adb kill-server sudo ./adb start-server sudo ./adb devices
even, this did not work. devices list only emulator not USB connected device