Get a blank page when triying to insert files from omnigallery

Installed OminiGallery 1.0.4. in wp 3.5.1 on my own host, put data in the omingallery preferences.

Now, when I try to insert images into my page/post via media library, an click on “OmniGallery” I only see a blank page – no tabs here where they should be (according to the screenshots on the plugin page there should be for Facebook / Picasa etc.) ….

http://wordpress.org/extend/plugins/omnigallery/