Author-Date style not showing year

I am using Endnote X5 with Microsoft Office 2010. I have my output style set to Author-Date, but most of my references (not all) have the year excluded. If I individually click on each citation, I can uncheck “Exclude Year”, but is there any way to do this for all citations? I have also tried other output styles that are supposed to show the year (like EMBO), but the year still does not come up. Why are some years excluded? Help anyone?

Thank you for your suggestions. I tried both, and it still excludes the year.

Actually, slight correction to my previous post. The fix works for all new references, but it does not for references that were in there before. Thanks a lot, I still have to go through a couple of references, but this will definitely save me some time.