I own the LRC for 1 Corinthians. This morning, as I was reading in this volume, the NICNT by Gordon Fee (1987) was referenced. It shows it as "locked" because I don't own it. When I click on it, it shows that I can by it for ~$19. However, in looking at my library, I do own it. Perhaps because I have the revised edition 1987/2014? I know they aren't exactly the same, but it would be really annoying to have to buy the older version by the same author just because LRC won't reference the new one.
I hope I won't run into this continually in the LRC.