When I open the program, I get several error messages saying it "Cannot Create" a user dictionary "USER_US.LXA."
Once I'm in the program and try to save a file, I get an error message saying "Error Unable to Rename." ... "Error #0"
And after that, I get a third error message: "Error Creating..." "File Access Denied."
The most likely problem is that you have BitDefender, or some other security software, that prevents Screenwriter from writing to your computer. The solution is to whitelist Movie Magic Screenwriter.
For example, here is what Windows BitDefender looks like: