Users can logon to terminal server session ok, but some can't open software package that has been installed on the terminal server. Others can and all have the same access to the server/program etc.
The software is a Ticketing/box office package the database is installed on a SQL server and the client software is installed on Terminal Server for users to access.
We are using Windows 2008 server R2. This problem is so frustrating as all users have the same rights but there seems to be something blocking authentication for some users.