"Strict Standards" error in backend

While using Media Tags I faced a bunch of PHP errors like the following:

Strict Standards: call_user_func_array() expects parameter 1 to be a valid callback, non-static method media_tags_init() should not be called statically.

Fixing it is easy, see:
http://wordpress.stackexchange.com/a/82247

I opted for making all methods in wp_media_tags_plugin static:

public static function media_tags_textdomain() {
    ...
}

Maybe that’s an option for you, too?

https://wordpress.org/plugins/wordpress-media-tags/