As many others I also have had a problem with PDFCreator when trying to print something under non-administrative user account.
So my problem was:
1. I have successfully installed PDFCreator 1.2.3 on 64-bit Windows Server 2003 R2 with Terminal Services.
2. I had no problem when trying to print something on PDFCreator printer as Administrator.
3. I was unable to print something on PDFCreator printer as regular user - no output, no errors.
Someone here has mentioned HKEY_CURRENT_USER\\Software\\PDFCreator\\Program\\PrinterTemppath parameter. So it does work - after changing this parameter to some folder with all-can-read-and-write permission for any regular user.