Asyncronious Microflow Calls and older environments

Jouke's blog on this was a big help to "fix" some of the problems I had with pre-commit workflow on some registration form, where the flow did validation first, and on a no errors progressed in calculation and connections. Works like a dream, however....... for some reason this wont work on some combinations of (older) OS + browsers. As I am far from expert in things HTML etc. I hope that someone can shed some light on this. I have a client running XP/IE8 and XP/Firefox 16(ish) that has n problem with 99% of the workflows in the application, but where the asynchronisch workflow does not even pop the progressbar !!
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