I am using Mendeley to compile my references and papers. I export automatically a .bib file for the folder in question and it appears and updates seemingly perfectly.
However, with a List/TOC--->BibTex Bibliography--->MyBIBFile.bib inserted some of the papers just don't seem to show up when I try to add the citations. Sometimes they appear, sometimes they disappear. Some are constantly working and never give problems.
When I open the .bib files in question in JabRef the articles not appearing are highlighted peach/red on the left hand side with respect to the number they are. Not quite sure how to remedy that or whether it would make a difference but I doubt it is co-incidence.