Hello,
,---- | The application serves, amongst other things, RTF and PDF documents to | the clients which are dynamically generated. Some time ago, in the | first half of this year, this ceased to work for RTF documents when | the client was MSIE 7. This happened after my customer's MSIE 7 | browsers received an automatic software update from Microsoft. `----
This sounds like problem I had some time ago. It happened for https with no-cache headers sent with generated content - some IE versions refused to save it to a temp file and passed an empty file to acroread.
-- pm