I've been fighting the damn License Manager for almost a year and with no help from this group.
I finally found the answer: Go to Macrovision.com and upgrade your lmtools,etc. All I did was download the three files, stop my license services, replace the existing files, restart the services. Bam. Now the licenses release automatically when the app is closed.
The LM app which ships with ACAD is broken. Upgrade it.