New major version of GD bbPress Attachments includes new features: attachments deletion control, hide attachments for visitors (must be logged in to see them), Polish translation and improved detection and adding of plugin CSS and JS code. Reported bugs are fixed.
One of the problems with the deleting of replies was that attachments for deleted replies were automatically moved to topics (WordPress does that for all hierarchical post types). Now, there are options to control this, and you can have attachments deleted also, you can leave attachments in the library, but they will be no longer attached to topics or you can leave things as they are now. New option is added to hide attachments for visitors. They will not see attachments until they are log in, and they will see such message only. This option can be overridden for individual forums.
As for the bugs, only one was reported and fixed: meta settings for forums were visible to all users. This is now changed, and only admins can see and change those settings. POT file is also updated, so all translators should update translations, and they will be included in next minor revision of the plugin.
If you notice any problems, please report them in the comments or in the forum. All suggestions are welcome.