Today I cleared out my entire .netbeans/7.0 directory and reinstalled jvi using the plugin manager. This time I selected
the option to "Force to install in shared directories" so that jvi would stay installed even if I blew away my .netbeans/7.0 directory again in the future. (See attachment for option selected.)
The module installed but on restart of NetBeans it failed to load jvi due to not being able to find a module in the shared directory and so I had to disable the jvi module.
I uinstallled jvi and then unchecked the option above and was able to reinstall jvi successfully.