XML Gallery works locally, but not online

Bit of an odd problem this:

I have a gallery which gets its data from xml, which is served up by a php script.

There is a menu before the gallery is loaded into a new container, which allows you to filter results within a category, or search for a particular title. If no results are found, an xml is generated with one default pic, and the caption ‘No results found’

If I test the menu from flash, all works as it should, reading the xml online. However, when I upload it, the ‘no results found’ does not work (Preloader does not move), although I can check out the xml that is generated and it is there, and also one of the sections will not fully load, preloader bar sticks at 95% or so…

I am really puzzled by this, any ideas why this might be>? ;(