With everyone out of the Essential Forms program (if it's on a network), to pack and reindex the database go ahead and open the program on one workstation.
In the program up on the menu bar click on Configure>Preferences>Database and check both "Pack databases on program launch" and "Reindex databases on program launch", Click "Ok". Close and reopen the program once in that mode. Then, go back in and UNcheck those two boxes in Configure>Preferences>Database and UNcheck both: "Pack databases on program launch" and "Reindex databases on program launch, " then click "Ok".
The program attempts to pack and reindex the databases on program launch. If another user is already in the program (or if the program thinks another user is in there), it can't pack and reindex because the databases are presumed open. So if everybody's out of the program, the next user to open it (if they have the switch or the configuration setting in place) will perform the pack and reindex.
If everybody's networked to the same database, only one user needs to successfully perform the pack and reindex in order to fix the problem.