I'm so close to having your great plugin working on WPMU. I created the single file and added the pages as outlined in your instructions for customizing the plugin for my theme. Only I am using it as a second instance of the plugin (so to speak).
Everything is working great except the call for the thumbs/images. Looking at the source code I discovered that the plugin is calling the images from the main blog upload files (wp-content/uploads/wpbdm) and not the sub-blog uploads (wp-content/blogs.dir/3/files/wpbdm) even though the images are uploading there.
Do you know of any work arounds?