Either the program has been validated previously, and the information being typed into the validation form does not match what was entered when the original validation was done, or you have 0 credits left.
Remember: the program is licensed for only one user.
The freezing problem does not occur in the most current update of Screenwriter 4.x, which also provides much greater stability.
To download and install the most current update, please click on the link below.
NOTE: We recommend upgrading to Movie Magic Screenwriter 6.