Resources tab won't update to new content
I built a yearly compliance quiz in SL that I update each time, based upon the last version--saved as a new file, of course. In the resources tab of the player I put a pdf document with the info they need to complete the quiz. This time I've attached the pdf directly from file. I uploaded to a test web server for testing. Clicking on the Resources tab does not bring up the current version--2015--but the previous--2013--that had been put in the resources tab as a URL to our LMS server. I've checked repeatedly and I did indeed delete the reference to the previous URL version. I also deleted and re-added the pdf file.
I'm sooo confused. How on earth is it doing that and, more importantly, how to fix it?