After loading and starting a few examples, the device selection dialog shows "No Device Found", while running "adb devices" gives the following (instantaneous) output:

List of devices attached 
038e79892520610d	device

I noticed this with the latest RC packages (#100) and not with the one before (#99). It's not 100% reproducible, so that could be due to chance, but it happens fairly quickly (after running two or three examples), so it seems a bit as if the regression came in between these two packages.

Unplugging and replugging the device does not help, but restarting Qt Creator does.