[Zope] Errors Viewing PDF Files

Our site has some PDF's in the ZODB. The files don't show up properly inside the Acrobat plugin. Pages are missing. Browsers that save the entire file locally to disk are unaffected. Traceback (innermost last): Module ZPublisher.Publish, line 98, in publish Module ZPublisher.mapply, line 88, in mapply Module ZPublisher.Publish, line 39, in call_object Module OFS.Image, line 328, in index_html KeyError: 65536 The KeyError value varies from viewing to viewing. Although it says OFS.Image, I checked and these ARE file objects. Thoughts? Ed (Zope v 2.6.0)