pdf doesn't open
I tried to access some of the pdf files I have in my Zotero but they will not open. I get redirected to a new -empty- page in my browser. Exactly the same thing happens when I try to access the same articles (as pdf's) through the databases of my university library. I don't really know where to start. "Ordinary" pdfs on my harddrive open as usual.
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The issue you're seeing is a Firefox issue - Firefox, for whatever reason, doesn't properly open your pdfs. We can't help you all that much with that, especially since it sounds like it's not a Zotero issue - but you should be able to find a number of suggestions by googling - the best solution will also depend on your operating system, e.g.
http://www.zotero.org/support/kb/file_handling_issues