Demo Importer wont start in Ubuntu

Hi, first of all I would like to praise your work and your themes, they are really great.

I am a beginner in wordpress and i have a weird problem. ThemeGrill Demo Importer wont start importing in Ubuntu?

It is a local installation of wordpress, the theme is Spacious. First I installed the theme and the necessary plugins for demo import, but when I click on “confirm!” Nothing happens, it just doesn’t react.

On the other computer where my Windows 7 is installed, there are no problems, everything works perfectly with the Flash theme.

I don’t understand what the problem is. It would be nice to work in ubuntu, because it’s faster than windows.