Debugging of my app is now suddenly broken. It has been fine up to now and I even reloaded a known good version of my entire code and it still fails to debug or even run.
Occasionally Eclipse and the various Android development plug-ins will become out of sync. I usually attempt the following when debugging / development gets "funky"
Open a terminal on your platform and use the tool adb
in the "platform-tools" directory.
adb kill-server
adb start-server
Stash your working copy and revert your source code if using a repository.