V6 not properly translating V5 file (Web/HTML output) ?

I have a file that I origianlly created in Xpro5 which consists of several dropdown and fly-out mouse-over effects. When I open the file in V6 and "check" the file with the "Export and Preview" button, the mouse-overs of the dropdowns don't work as they do with V5. I tried to save the file with V6 with no improvement, but it still works with V5 (although with a notice that the file was saved with a newer software version).

The file isn't completed, and I wanted to finish it in V6. Have I missed something in the upgrade? Should I have done something before or after I edited with V6? Will I have to completly re-create the file to use V6?

I'm including the file in case that helps.

Thanks for any help offered.