events no longer showing

Hi,

using your perfect plugin for weeks, but unfortunately it is no longer working for me:

I can add an event as usual, you can even see the event after successfully saving it. But as soon as i refresh the page or move to another item, it disappears and you can't see it any longer, nowhere, but in the administration statistics.

There can maybe be an error with another plugin, but how else can I try to get a list of items (print_r in any file?) ?

Any notices for me? Any known problems with other plugins? Can give you a list if needed.

 

Thanking you in advance