Whole ASP Page not Served unless 'Enable Buffering' is Off

Hi

I am experiencing a problem whereby IIS is not delivering all of the
resulting HTML output from an ASP Page. I have tested this on several PCs
and browsers and although the HTML returned varies, in all cases the whole
of the page is not returned.

We have recently moved this website from a under-specified server to a very
highly specified machine. On the old machine we never had this problem.

The problem is not only with one page, but with several that return a fair
amount of HTML.

If I turn off "Enable Buffering" in the website property pages IIS returns
all the HTML as desired but the performance degrades markedly.

Can anyone help me work this out so I can turn buffering back on?

Thanks

David M