When I click on the refresh metadata icon on album from zenphoto/zp-core/admin-edit.php it appears to try and refresh the metadata from all of the images in the album. I can see this because the id value in the URL line is steadily rising from 3112 (the smallest ID in zp_images, up to 4820 at the moment). Having a quick look at the code it looks like what should happen is that the mtime value for the images in the album are set to zero and then any image where the mtime doesn't equal that of the file is refreshed. Running in mySQL:
SELECT COUNT(*) FROM zp_images WHERE mtime=0;
gives 52. There are 53 images/videos in the album.
Any ideas what is going wrong? I did have a plugin that filtered on image_refresh but I have removed that for the time being.
I am running zenphoto version 1.2.9