If everything was working before you upgraded to 11.4 then I suspect a problem with Helios. Upgrading Helios will not make the T-Max Manager go bad.
Do you have ADNET2000 loaded on the computer? If so close Helios and see if you can get ADNET 2000 to communicate with it.
If you don't have ADNET 2000 loaded you can download it here:
http://www.appdig.com/adnet2000.html Kevin Barrett
ADI Tech Support