eclipse program stops at launching 27% - eclipse

i just installed eclipse 3.5.2 on my ubuntu 10.04 and also the ADT and the plugins for the android api.
When i first run an app lets say test.java it works great, but if i make a change and try to run it again the emulator doesnt works and at the down right corner displays this message :
"Launching Test: (27%)" and the emulator displays the program as it was without taking effect by the new changes.
You can check what i said at the right bottom of the pic.
thanx

The issue happens when launching the first emulator from the Run button in Eclipse.
To avoid:
Start Eclipse
Window -> AVD Manager
Start an emulator
Run the project

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