Thank you for your help. I opened this new thread to give you more information.
I am using this theme: http://www.blogohblog.com/wordpress-theme-black-and-white/
On my website it is lokking like this: http://speakerheadz.com
Here is my problem:
When I activate the widget in the admins menu. And enable the plugin in the plugins options, the slideshow is not shwing on my frontpage. And that is not the only problem, because all text and blog pictures are missing! I can only see Titels and blank blog spaces.
When I deactivate the widget in the menu, all the text is back. And my blog is back to normal.
What am I doing wrong? The only thing I did was activate and enable the plugin. I din not changed any code (ever on my blog) or use shortcode.
I hope you can helo me, because using the Slideshow would be awesome!