Cannot write to XML from web page

I have written a small application in HTML/CSS/JQuery/XML/XSLT that ends up writing to an XML file located alongside my files on the server. Everything works fine 99% of the time, but som users experience problems when writing to the XML file.The users that experience problems all use computers located at their working places, which for all users appear to be in large companies, assumably with strict security measures. But still - the XML is on my server, shouldn't really be relevant for the most paranoid system in the world?Now, I wonder what exactly this can be. What causes this? And how can I detect this problem-users so that I can give them special treatment?The site can be viewed at www.northcreek.no/em
 
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