Flash and Xml web service problem...

Im working in ths flash app that reads xml from a web service… consulting the pages directly its ok, no problems,... but weird enough, when i browse the flash in explorer fails to log in, and fails getting the data right,... but, when i browse the app in firefox, enters ok and without any problem… its very weird, i downgraded the flash exporting version to 8, gave all the variables a unique name assuring none could cross, but its still misterious,.. i mean, reading the xml is pretty easy, if there was a problem with the xml itself it wouldnt load,... but it runs fine on FF, not in IE… i know i should give all the details, but i think that starting from the big picture and going closer may be clearer…