Blocker Description
If a user switches between "use symlinks" or not (or, say, has ant/ivy configured with symlinks but Eclipse/IvyDE without symlinks), the ivycache can be corrupted.
Specifically, if a symlink was setup in symlink mode:
lib/foo.jar --> ivycache/com/foo/foo-1.2.jar
And then later we retrieve into lib without symlink mode, Ivy retrieve will write, say, foo-1.3.jar's bytes into the lib/foo.jar location...which will then overwrite the foo-1.2.jar bytes in the ivycache.