Download of a PDF file fails


When I click on a URL for a pdf file (i.e., it ends .pdf), the browser screen goes white (Safari) or black (Firefox), no file content shown. Then, if I click
"save as ...", I get message
[Could not export file "thisfilename.pdf" as "thisfilename.pdf". ]

Sometimes a download occurs, but the resulting file is not readable by Preview or Adobe Reader.

I've tried both Preview and Adobe Reader as the default app for pdf files, it makes no difference.

So it seems to be the *interface* between any browser and the pdf format that is faulty.
Any existing pdf files on my system open OK with both Preview and Reader.

Any suggestions how to fix this?



The problem occurs with any pdf file, not a particular pdf file.
I was unable to download a PDF file from any URL at all!!!

I have now solved the problem with advice from another source. I had 2 adobePDFViewer.plugins, and when I disabled the older one (dated 2008), I was able to dpwnload pdf files again.