I have a client that is still having this issue. They have a 2-user lanpak, we've deleted the EZSSILCK.LD4 file, and I've run the system updater, and they can't get more than 1 user in each module at a time. Do I uninstall and reinstall the lanpaks at this point?

Is it really this issue? A lanpak in use count greater than the total number of lanpaks installed at the site (see Help | About for the count)?

Is their lanpak registered? What does the Help | System Status | Check Lanpak Status report? I really doubt it's the same issue.

What is the version of the Lanpak and the version of the Adagio programs in use? It may be that all they need to do is install an updated lanpak version.

This was not the same issue. The problem was that the Lanpak was installed to the wrong folder. A proper install resolved the issue.