Hi Rod,
1. The project is actually 70mb when published. It runs for 15 minutes. It includes 4 videos and 15 questions.
2. Most of the slides that are not question slides are no more than 30 seconds and some shorter. A few of the video files last for over 3 minutes.
3. the buttons that don't work from the start are my reources slide (which goes to a resources page) and a help button which goes to a help page.
The funny thing is that these buttons work without problems in some of the earlier version of this project.
Thankyou