Problem with POST data from flash to JSP in IE 6+

Hi,
I have a swf on an insecure domain calling a java servlet on a separate secure domain (by flashes standards). I placed a crossdomain.xml file so that this could happen. I’m using sendAndLoad() to send POST data to the servlet and i believe it’s using response.write to send the text string back to the swf (I’m not the one coding the java). The file works fine in all browsers (PC and Mac) except for PC IE 6+. I have a “server error” message set to come up when the sendAndLoad() returns false and it does so as soon as you hit the button. I can’t tell if the data is never being sent or just never being returned though. a dynamic text box shows the variables returned and shows nothing. any ideas?
I told the dev team i don’t see why it would be flash’s fault. They, in turn, say they don’t see why it’s java’s fault. I’ve scoured the web looking for answers. I’m not even sure I looked in the right places, but i’m not even sure what to look for. I’m thinking it’s an IE security issue? But then we’d still have to get around it… any help is much appreciated.
Thanks,
joe