TSPrint offers two different dialogs to configure the default printer. The first one is working on a per user basis and each individual user can set his own default printer by logging in to the terminal server and going to:
Start -> Programs -> TerminalWorks -> TSPrint Server -> Default Printer
If you wish to disable the defaulting of printers by TSPrint and leave it to Windows then select None as the default printer.
The second dialog is working on a per server basis and allows the system administrator to configure the default printer for all users on the terminal server. You can reach that dialog by going to:
Start -> Programs -> TerminalWorks -> TSPrint server -> Server Options
The server options dialog will allow you to select the default printer for all users on the terminal server. As with the per user default printer dialog here you can also select None to tell TSPrint to leave the defaulting of printers to Windows.