Why do I get a "No more users allowed." message when starting TPM?
The standard version of Teacher's Personal Markbook is licensed for use by a single user. To ensure the licence is not exceeded a file named LICENCE.NAF is created in the Windows Application Data folder for TPM. This file keeps a count of the number of copies of the program running simultaneously.
If the TPM program ends in an unexpected way, for example after an error, the LICENCE.NAF file can lose track of the number of copies of the program running. This may result in the problem message.
Deleting the LICENCE.NAF file before starting TPM, resets the count to zero and allows the program to run.
The location of the LICENCE.NAF varies depending on your system, but the message box lists the complete path so you can delete it. If your copy of TPM does not show this path, updating to the latest version will add this extra information to the error message.