I have a same problem in demo version too...

Have you had X5 V7 on your computer?

Double check you haven't had an Incomedia folder in Documents.......

Hi, I think the problem may depends on error in the v8 project.

Probably you set the same filename for one or more pages in Step2 | Map. Please open your project using v8 and check the filename for all the pages to be sure that there aren't more than one page with the same filename.