pcAnywhere Changing Security Policies

I have always purchased and installed pcanywhere on computers being used on my automation plant network without any issue. Recently we added a new 2008 server that we are in the process of making our new domain controller for 20 workstations. While in this process we found that if we remote desktop into a workstation then disconnect from it, it does not release the host waiting for next caller. You must reboot the machine running host before reconnecting to it, or stop and start the service and restart the host. Versions of pcanywhere installed are 10.5 to 12.5.1, we are upgrading equipment and software gradually. We are wondering if something in the 2008 domain is changing security policies, but some of these machines have not been joined to the new domain yet. They are however on the same LAN with the new server. Any help would certainly be appreciated, Thanks