I have passwords on every subalbum.
In the main view there is only a icon with questionmark instead of a random image from the subalbum.

I think this is because all subalbums are password protected.
But how can I change this behavior to dispaly always a random image from the subalbums?

You will have to create your own version of the random image function. The standard one will not show password protected items.

Thanks, can you please write down in which file this function is?

I do not understand. I believe I said you would have to create such a function. If you are asking that one of us write it for you, please visit the paid support link on our WEB pages.

If you asked where the function there is a documentation and all functions are named "speaking":
http://www.zenphoto.org/documentation/functions/_template-functions.php.html#functiongetRandomImages
http://www.zenphoto.org/documentation/functions/_template-functions.php.html#functiongetRandomImagesAlbum
http://www.zenphoto.org/documentation/functions/_template-functions.php.html#functionprintRandomImages

Thanks for the info, but I don't wanted that you code it for me.
I want to change it on my installation.
But I needed the file with the function who is checking the password on the random images for albums.

I've found it now in class_album.php, function getAlbumThumbImage and changed it.

My next problem is the "latest images".
The same problem only public images are shown, but I want to show also the private as latest images.

But as of now I didn't find the right php/class file to remove the password check.

Where is the "latest images" function located?

latest images is part of the image_album_statistics plugin. In any case you need to create your own custom functions either via custom plugins or your themes functions.php. Otherwise you will have to re-apply your changes with any Zenphoto update.

As just a side note (in case anyone references this thread), the StopDesign theme uses it's own function in the index.php so that the random images / recent images works even without image_album_statistics plugin turned on. It's not advised, but if you are writing your own function anyway you could either use image_album_statistics as a base to go by the plugin architecture or just use the StopDesign function for the base of your new function and modify it as a "quick and dirty" fix.

Thanks for the information.
I will have a look at it.

image_album_statistics has indeed a random option. But all official themes that use random images don't use it but the randomimages functions linked above.

Thanks for the clarification, Acrylian. Much appreciated!