[TYPO3-project-seminars] Problem with event view of seminar manager

[Andreas Balzer]

Hello everybody,
I'm experiencing a very big problem. I have several seminar records and 
seminar sites, etc.. but they don't show up in the FE (Momentan konnten 
leider keine Veranstaltungen gefunden werden.) Further on the icon of 
the seminar records changed somehow (see 
http://img253.imageshack.us/img253/3351/seminarproblemqw7.jpg)

What is this and how can it be solved?
Thanks for your help.

Greetings,
Andreas