I get and application error (memory reference error) and the program terminates on a import with the wizard to a new file. But I believe I have found the problem, or at least a work around.
It appears that there must be at least one lesson, before one is imported with the wizard. I originally removed the default "Lesson 1" as I didn't want it. Then used the import wizard. The error occurred at the Finish of the wizard.
Leaving the default lesson in the file and then importing works. I now know to delete the empty lesson after the first import.
Thanks