I did some googling and searching but I cannot find any reports on this problem yet.
It is a very strange bug: at some point all valuelists do not show up anywhere anymore.
It happens on Windows/Mac systems, nor is there a difference in how the list is configured, even the custom (plain text) lists present themselves as empty.
The only way to get everything going is quit filemaker and open the file again.
(It's not known if GO / webdirect versions have the same problem as there are not being used in this setup)
Any ideas ?