AICC quiz fails to close window and no results reported to LMS

Hi

When creating quiz content with Articulate Quizmaker and iSpring, the quiz uploads and runs fine, however on reaching the final question the window fails to close and nothing is reported to the LMS

I had thought this was a problem with Connect, but have just created a quiz using iSpring but the outcome is the same.

Anybody have similar problems?  any ideas of solutions?

Dave