Using BinaryWrite with iPaper

[db...@applaud.uk.com]

I seem to be having mixed results when passing documents to iPaper
from a database rather than a file on a filesystem.

It works faultlessly with some document types; PDF's, Word and Excel
2003 etc. but consistently fails with all Office 2007 documents and
even Powerpoint 2003.

A typical example would be the file

http://v4.vestri.co.uk/contentimages/1page.pptx

which imports and is converted perfectly, but exactly the same file,
fetched from a DB and passed via a BinaryWrite:

http://v4.vestri.co.uk/Preview.aspx?ID=dd93172f-3c72-46c4-b182-6609d514f64e

Seems to import ok but the conversion process loops indefinitely and
when I view My Docs I see a whole series of documents with the status
'Conversion Failed'.

Any ideas or suggestions?

PS. The MIME type for both links is set to
application/vnd.openxmlformats-
officedocument.presentationml.presentation