Actually, when I reattached the last pdf I had added it crashed Endnote again. Deleted it from the data folder again and everything works fine. Re-download the file from the web and attach that to the citation and everything is good! So somehow a “bad” pdf can screw up the works? I have used 2 older versions of Endnote for 2+ years with 2000+ citations and never ran into this. Is this something that was just a matter of chance or is this yet another way that the X6 version is an un-improvement on earlier versions?