Difference in local vs server?

HAS THIS EVER HAPPENED TO YOU? FINISH A SITE ON THE LOCAL MACHINE, POST TO A SERVER AND HALF OF IT WORKS AND HALF WONT? HERE’S THE REAL PROBLEM (OR SO I BELIEVE) HOW MANY SWF’S CAN YOU GO INTO USING KIRUPA"S PRELOADING EXTERNAL ASSET TUTORIAL? I USE THE CODING TO LAUNCH JPEGS DIRECTLY INTO AN EMPTY MC - BUT BEFORE I DO THAT I USE THE SAME CODING TO LAUNCH THE SWF THAT CONTAINS THE EMPTY MC, AND BEFORE THAT THE SAME CODING TO LAUNCE THE ROOT SWF. AGAIN, ALL THIS WORKS GREAT AND BEAUTIFULLY LOCALLY, BUT FOR SOME BLOODY REASON, WHEN POSTED TO THE SERVER, THE JPEGS WILL NOT LOAD. IM GOING CATATONIC AND REQUIRE A LITTLE BIT OF SoMEONE ELSE’S WISDOM.