Licx file issues - TeamCity build fails on server but user intiated build passes

Hi guys
We are having some issues with one of our UI project not building on the build server.
We are using janus win controls that have the typical licx file associated. We have an MSBuild script that builds our solution which when run by myself on the build server (ie the same command TC would issue to the same file on the same machine) everything works, when TC runs it fails. FYI - TC is running under a service account, thats pretty much the only thing i could think of that could be associated

exception is:

• Properties\licenses.licx(1, 0): error LC0004: Exception occurred creating type 'Janus.Windows.EditControls.UIGroupBox, Janus.Windows.UI.v3, Version=3.5.0.0, Culture=neutral, PublicKeyToken=21d5517571b185bf' System.ComponentModel.Win32Exception: The parameter is incorrect
  
• Properties\licenses.licx(8, 0): error LC0004: Exception occurred creating type 'Janus.Windows.EditControls.UIComboBox, Janus.Windows.UI.v3, Version=3.5.0.0, Culture=neutral, PublicKeyToken=21d5517571b185bf' System.ComponentModel.Win32Exception: The parameter is incorrect

Any ideas?

using MSBuild & .Net 3.5 on x86 machines, svc account that TC build agent is running under is even in the admin group on the server

Thanks in advance

Rhys Campbell