I updated the plugin to use Thinkdreams' modified version from yesterday, and lo! the thumbnail now appears. Still getting the odd size mentioned in this thread, and the other plugin admin UI weirdness, though.
Nevertheless, thanks for maintaining this plugin, Thinkdreams!
Can someone fix the random images for the recent version, it says
Fatal error: Cannot redeclare getrandomimages() (previously declared in /home/daxenoc/public_html/zp-core/template-functions.php:1320) in /home/daxenoc/public_html/themes/stopdesign/customfunctions.php on line 9
You should try using the stopdesign theme which is included in zenphoto. I am sure your version is older. The old theme version had the function in its custom functions file, which is not necessary anymore because the getRandomImages function is in the core now. The theme tries to call the already declared function a second time, that's why you get the error.