I experienced two versions of this problem that have different solutions.
1.) Clear all projects in the workspace as described in other answers.
If it gets stuck while cleaning up a project because it never gets into this operation in the process queue, try the following steps.
2.) Make sure your workspace directory still contains the .metadata directory.
3.) Switch workspaces and then try to return. You may need to force close Eclipse during the switch.
4.) If all else fails, try manually deleting the .metadata directory, and then reinstall the workspace.
Josh Mar 30 '14 at 17:00 2014-03-30 17:00
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