For database changes so called patchlevel updates are necessary. At this the database will be updated to the current version. Stop the Enterprise server and go to the database overview ("edit" -> "database overview"). In the column patchlevel you can read out the current patchlevel of the database. If a new patchlevel is available this will be displayed by another symbol (first column) and by a change in the patchlevel column. For example at an update from patchlevel 7 to 8 this will be displayed in the patchlevel column as follows

 

7 -> 8

 

With a click on the database in the database overview with your right mouse button you can update the database to current patchlevel. Do this update for every database so that the clients can build up a connection again. If the client should not be current the user will be advised by a message.