NAV 12.4 (73) keeps MacBook Pro 10.7.5 from shutting down or restarting

I installed NAV 12.4 (73) and it is keeping my MacBook Pro with Lion (10.7.5) from shutting down or restarting (unless I override by holding down the power key for 4 seconds).  If I uninstall it then the computer shuts down or restarts fine.