Android :: Debugging Project In Eclipse Suddenly Doesn't Work Anymore

I am developing on Windows machine.I was working quite well until yesterday, when I saw the the update prompt and updated my ADT plugin. Today when I tried debugging my test project, I experienced either one the following cases:

1) Logcat stops forever on the message "sending wait chunk".

2) Logcat shows the following message, and test project fails:

3) Eclipse stops responding.

The above cases happens even when the test unit contains nothing.Also it just doesn't not work in debug. The test case runs successfully if it is not in debug mode (But there are still some glitches, like Logcat sometimes won't emit debug messages).