Seems I have to modify my build procedures now that I’ve given a few libraries strong names and placed them in the GAC. Unlike previously, each component simply used whatever the current library was in the program directory. Unfortunately, now that the MARCEngine is signed, each component that links to it needs the reference recompiled. How’d I find this out? Well, I just got a message that the Z39.50 client stopped working after the last update. I checked, and this was the problem. So, I’m in the process of modifiying my build procedure when dealing with the MarcEngine and have uploaded a new version at: MarcEdit50_Setup.exe that corrects the incorrect assembly linking.