download links and cover pictures may be related to theme you use – check source code of generated page and CSS – may be class name conflicts.
shortcodes are explained when you edit gallery like this:
You can add the Single Gallery on the page or in the post by inserting this shortcode in the content:
[print_gllr id=X]
If you want to take a brief display of the gallery with a link to a Single Gallery Page:
[print_gllr id=X display=short]
first shortcode display pictures
second shortcode display coverpage and description with link to gallery like in galleries index page.
all other things you need to know are in FAQ
