This sounds like the customer may have defined an Environment Variable that points them to the network in order to get all of the configuration files, these configuration files control the colors. Normally you would define a System level Enviroment Variable because this will point VeSys at the network configuration files regardless of who logs on. To check this login as the customer and click the following:
- Control Panel
- Environment Variables
You are looking for one called VESYS_DATA_PATH, you can either copy this to your user account or you could just edit it so that it is a System variable rather than User based.