Xamarin for VS - build, but can't see an emulator

Hello!

I've installed Xamarin and tested it both on VS2010 and VS2013.
After creation or opening an Android project (any project, e.g. "Hello, Android" from the guide) both studios give the same error - "Error populating device list".
However project builds without errors.
But I can't start it in the emulator ("Device: is either not running or not attached" in VS2010).
It starts ok in Xamarin studio and publishing without problems to the emulator. But VS can't see this emulator.

I've tried to uninstall/install Xamarin, VS, Android SDK a couple of times, but it doesn't help.
What should I do?