This issue only affects machines with certain security profiles or virtual machine settings. The TransMagic License Key is stored in the public area of the registry (HKEY_LOCAL_MACHINE) and hard drive (C: Progam Files) and is not user specific so there is technically no reason for this to occur. Theoretically, only one user needs to license TransMagic and 99% of the time, there are no issues with multiple user logins. Each user who is prompted to register should follow the registration instructions so that they can activate TransMagic for their login.