After I updated my ADT/Tools to 20, I am not able to start Two Emulators at a time.
It worked Once. But i don't remember what i did that time.
I tried restart my system several times.
I don't know how to locate whats the problem in emulator.
the emulator is shown in TaskManager Process but not on screen.
EDITED:
Reported as bug http://code.google.com/p/android/issues/detail?id=34221&sort=-id&colspec=ID%20Type%20Status%20Owner%20Summary%20Stars