Problem with loading variables

I tested my whole Flash site on local PC over IIS (localahost). All vars works properly.
If I uploaded the identical files than I can´t load those variable, even if the path (folders, etc.) is identical.
Why please?

I use main SWF, which is called over HTML file and the external SWFs I load into the main SWF.

My code first load variables in main SWF and than I call this variables into external SWF, which are loaded into the main SWF.