Hi Ira,

This looks like it might be a tricky one to track down the cause of - I've tried to reproduce it but no luck yet.

Would you be able to try and reproduce the issue with a new course, e.g. create a new course, create a couple of quizzes and link them in the same way, and see if it happens every time? If so,  can give us step by step instructions on how you got the error to occur.

If you could leave debugging on the whole time and post any other error you get that would be great.

Simon