Just hit the problem another guy had before,
with the gallery folder "wp-content/uploads/albums/" all images in back-end (when I open a folder and check thumbnail or full url in top right corner) has double "/albums/", in this way:
In database, image's slug is correct, but every _wp_attached_file meta key starts with "album": album/folderXX/imageYY.jpg
AS a result, in front-end all images either don't show at all, or show "missing attachment.
All folders were picked up by the ajax script, my theme is a child theme of twentytwelve, wp 3.5.1, EZG 0.1.0-RC-2, active plugins - "Auto ThickBox Plus" and some definitely irrelevant tinymce enhancement.
Tried it twice, second time by deactivating plugin, removing everything EZG-related from database (options, posts and metas), deleting in filesystem and re-transferring all photos, activating EZG, saving settings, opening "all folders" and going away to let it discover photos in peace.
It died couple of times with "An error occurred while indexing your gallery. Please check your server settings to solve this error: 500 (Internal Server Error) - Internal Server Error" but that's probably low-end hosting issue. Nothing in logs.
And another bad one.. when I edit the slug for a folder in "quick edit" mode, a new empty folder with the slug as a name is getting created and then picked up by ajax script. Didn't test this thoroughly but it seemed like the original folder (non-empty) also loses its caption. Will
Oh and "Recent folders" widget seems not to honour "Number of folder icons to show" -- displays the whole lot.
Sorry for ruining your Sunday ))