I've just updated some things with the SDK and donwloaded update for the ADT. Now I get a red exclamation mark in the Project folder.
The console tells this:
Found 2 versions of android-support-v4.jar in the dependency list,but not all the versions are
identical (check is based on SHA-1 only at this time). All versions of the libraries must be the
same at this time.
Versions found are:
Path: C:\Media\Eclipse Workspace\project1\libs\android-support-v4.jar
Path: C:\Media\adt-bundle-windows-x86_64-20130522\sdk\extras\google\google_play_services\
libproject\google-play-services_lib\libs\android-support-v4.jar
Jar mismatch! Fix your dependencies
Had to say, that I created a project importing google-play-services_lib to set as library in other projects ass this where I had to use google maps.
In Java Build Path\Android Private Libraries I've got 2: google-play-services.jar and android-support-v4.jar.