One persistent problem we have between Summon and EBSCO is abstracts indexed as articles in Summon. Some journals index these abstracts as individual titles, which is why they get pulled into Summon as standalone full text articles, but EBSCO (which is where we have full text) does not index them at all. So not only does the openURL break, if you search for them in EBSCO you often get zero hits. Since we have so much full text in EBSCO, this accounts for a good many of our bad urls in Summon and it is frustrating and confusing for librarians and users.