[Plugin: Event Calendar] Content doesn't exists anymore :o

Hi everybody ??

I would like to use a event calendar on my blog.
I have tested it (on a localhost) with this plugin:
https://wpcal.firetree.net/
.. and I felt very happy with it ??

Now on the live-system, every time I activate the plugin, the content in the frontend doesn’t exists anymore (message “Nothing found” and it gives me the search box..) and on the backend on “All Articles” there is a message that there are no articles.
If I deactivate the plugin, everything works fine ??

Have already deactivate all other plugins.

Somebody have an idea to solve the problem?
Very thanks ??