Data display, security and xml vs. e4x

Win XP, Mac OS.
Flash Player 9.x
Create an HttpService object with resultFormat ="e4x".
The service accesses a url in an external domain, so create a
crossdomain.xml file with all domains wide open for the moment.
In result handler, assign data to a list, text box, whatever.
Deploy the swf to my http server.
Access my swf with web-browsers on Mac and Win.
Expected:
Properly displayed data on all platforms.
Actual:
On Mac OS the data display works perfectly well, but on Win
XP no data is displayed: according to the browser's status bar, the
http request is made, and data is returned over the wire, but the
components are left without content.
Attempts to fix:
Though no security dialogs popped up, the symptoms seemed to
map to a sandbox issue. Double-checked crossdomain.xml file, making
sure I could see it at the swf-domain's root. I tried several
different settings in the crossdomain file, and had it deployed in
several different locations to be sure I had covered the search
path. No change in the results: it worked on the mac but not on Win
XP.
Workaround:
Change resultFormat ="e4x" to resultFormat ="xml". The data
displayed as expected in the Win XP player. The mac display
continues to work properly.
When should I use xml and when shoudl I use e4x? I don't
notice a performance difference between the 2, and I don't have to
change my result hanlder code to switch from one to the other. The
only (important!) difference I've observed is that on Win I can
reliably display my data with xml whereas I cannot with e4x. Can
someone please explaiini this?
Text
Text

Thanks. I'll look into that, but I will have to use xml at
least temporarily as it is the only workaround.
Any idea of why e4x would work on the mac but not windows? My
assumption was that the data did indeed get to the client since it
works on the mac. However, you seem to be saying that there still
might be an issue with some other aspect of the data transport. Is
it possible that Windows is doing something to the e4x data that's
implemented differently on the mac?

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