If our 'Modern' demo gallery works fine but your own test gallery (on a page of its own using the same version of SimpleViewer) does not, then the problem may be to do with either your web server or internet connection rather than the gallery itself.
If you are viewing the gallery over a 3G connection rather than wi-fi, please see this FAQ:
Why can't I view my gallery on a 3G mobile connection?
If you think that this might be a contributing factor, a possible solution would be to create an .htaccess file containing the following code and upload it to your website's root directory. (Please note that this requires an Apache web server.)
Header set Cache-Control "no-transform"
This should prevent content modification on your site when visitors view your galleries over a 3G connection.
You could also contact your 3G provider to see if it is possible for content modification to be turned off on your account (although this will help only when you view other people's galleries and will not solve the problem of other people viewing your own galleries over their own 3G connections, which the solution above tackles).
SimpleViewer Support Team.