Sorry, but while I haven't resolved my previous issue, there is another thing driving me crazy now.
I have settings in Quizport http://www.strivney.co.il/mod/quizport/view.php?id=1582
set to no entry page and force resume (see screenshot). But when a student selects this Quizport they get the "Preview Unit Now" page and when viewing the quizzes the info and preview tab is displayed. Other quizports on the same site, with the same settings, go straight into the unit when the Quizport is selected and do not display the info and preview tab, which is what I want to happen.
There is a question as to whether my Quizport version is stable, but if that were the problem surely the other Quizports would be behaving in the same way?
So sorry if I have missed something elementary but I've been starting at these settings for two hours now.
Thank you in advance.