Not styled on Win7

Here’s a further point of interest. If I log into the site admin dashboard on any of these browsers the slideshow then appears normally in that browser. When I’m logged in, the file header link changes:

<link
  rel='stylesheet'
  id='cyclone-slider-plugin-styles-css'
  href='http://www.mydomain.com/?cyclone_templates_css=1&ver=3.5'
  type='text/css'
  media='all' />

I’d changed the theme during testing, but that doesn’t affect the behaviour:

• logged in as an administrator, Cyclone Slider 2 works fine;
• not logged in, it’s not styled.

I’ve temporarily copied all the required css into my theme’s style.css. This isn’t a long-term solution, but it’s better than nowt.

The link

href='http://www.mydomain.com/?cyclone_templates_css=1&ver=3.5'

is fine and displays the correct stylesheet. But the link only appears in the header when I’m logged in as an administrator. If I’m not logged in, the link is presented as

href='http://www.mydomain.com/'

This is the crux of the problem. I don’t know what could be stopping the stylesheet link from being fully formed when I’m not logged in as an administrator.