One of the first logs to check is /var/log/ebox/ebox.log.
It helps to open a SSH session, type tail -f /var/log/ebox/ebox.log and follow the entries as the are created while you are working on the Web front-end.
This way, you may get a clue on what is preventing those modules from starting.
Most likely there is some error in some configuration file (it may be a bug in Zentyal).
Anyway, give it a try.