There are 6 free skins at the moment in Gmedia Gallery plugin. One of them called Phantom is most functional skin which support almost all Gmedia features and it is the only one skin for now which support comments… and it is free. Yes, I’ll add “comments feature” to some other skins later, but at first it was added to the free skin, so don’t say that free skins are poorly.
The most common reason why gallery may not work – is a bad coded theme or JS errors in other plugins. I can’t test my plugin with all themes and with all plugins, but when users have some issues I’ve always helped to solve their problems. But I can’t understand what is your problem? In your profile you wrote that you are WP developer, but seems like it’s not true… you just waste time of other developers.
Those 6 free skins satisfy 80% of users needs. All premium skins are available for free with backlink label. You can try them without paying. There is no any advertising or annoying banners in the plugin (unlike some others plugins). Plugin also doesn’t have any limitations in free version, because plugin is free and it’s only your choice if you like/need some of premium skin.
My main priority in the plugin is the powerful admin panel for managing files. The skins for displaying these files could make any developer. Here is example how one of developers build new skin based on free one: https://codecanyon.net/item/phototravlr-gmedia-gallery-wp-plugin-module/13707001
