Observe_form and ssl on IE

Can anyone help with some strange error messages I’m getting on IE when
using observe_form.

I’ve written some code to observe a set of radio buttons and it all
works
fine in Firefox but when using IE about 20% of the calls return a
request.status of 12152, ERROR_HTTP_INVALID_SERVER_RESPONSE (and the
occasional 12030, ERROR_INTERNET_CONNECTION_ABORTED). It only happens
on
SSL pages.

Googling about I’ve tracked these errors back to wininet.dll but can’t
seem
to find any further info than that. MSDN suggests running the debug
version
of wininet.dll which creates a log of all the calls to wininet but the
logs
haven’t been any further help.

Has anyone else come across these errors?

Any info greatly appreciated.

Cheers,
CL