Dia show aus mehreren Alben

Try the following:

1.  Click on the Add Media icon in the top right corner of the Slideshow Editor

2. Choose Add Photos and Videos from Organizer

3.  Click the Advanced drop down arrow

4.  Select Albums.  This has a dropdown menu of the Albums in the Organizer catalog.  You can then select which photos to add to the slideshow.

Alternatively, create a new Keyword Tag called Slideshow.  Tag all of the photos from your Albums with the keyword tag Slideshow.  Filter the catalog by checking the keyword tag Slideshow.  Select all the tagged images (Ctrl+A). Click on the Slideshow button.  (I think there is a maximum of 250 files that can be used for a single slideshow.)  Once you have created your slideshow, remove the keyword tag from the images.