After I updated ADT / Tools to 20, I can not run two emulators at the same time.
He worked once. But I do not remember what I did at this time.
I tried rebooting the system several times.
I do not know how to determine what the problem is in the emulator.
the emulator is displayed in the ProcessManager Process, but not on the screen.
EDITED
Reported as bug http://code.google.com/p/android/issues/detail?id=34221&sort=-id&colspec=ID%20Type%20Status%20Owner%20Summary%20Stars
This error appears to be fixed in the latest version of SDK Tools, revision 20.0.1.
From the change history :
GPU.
AVD Manager .