Comment 9 for bug 238572

David is going to post some header information describing a number of different scenarios relevant to this problem. However, I will draw some conclusions here first:

We have placed a pdf directly into devtrain as a Silva file. It is located as a link on the very same page as the DL links that we are using to show the PDF problem. If you select the PDF from the direct link, it loads and displays perfectly every time. If you select a PDF link from the DL link, we get the problems described earlier. This is using the same server, the same Zope and Silva instance, the same browser, the same PC and the same adobe browser plug-in. The only difference is the method used to fetch the pdf and the location of the pdf itself.

So, it looks like have a problem which is specifically related to fetching a PDF file from the OAI repository via a DL Listing object in Silva and displaying it via an adobe acrobat browser plugin.

If you can access the page, have a look at http://devtrain.beds.ac.uk/isd/guides/gw. The direct PDF link is displayed underneath the DL links.