I ran into the same problem and it was driving me nuts. I could create a page, but if I tried to attach questions, it would not work.
I think I have solved the problem, at least on my machine.
While working on the lesson I disabled my Firewall and Anti-Virus (both Norton) and then it worked perfectly.
Creating lessons without a firewall or antivirus is very exciting and liberating. Definitely, only for the brave at heart.