I'm testing the trial of Vue Pro studio 7, and  when I' calling the help (F1 or "Apercu") from the menu, Vue launch the PDF but when I quit Apercu (the PDF reader), then Vue displays the rainbow wheel.
I forced it to quit and now every time I call the help (F1) from the menu, I get the rainbow wheel.

Actually I have the same problem with Vue 6, they just don't fix it ...

So before viewing the help, you have to save your work because Vue will hang, great software !