Well Bfoley, I'm still semi-new to this app, but after looking at your page and code, I think I might have identified two errors. The first error I think you are making is that I don't believe plogger was designed to work inside an "iframe". Not only are they very specific with the coding that needs to be used for them to work properly, but some browsers don't work well with frames and some people don't allow them. The reason I believe it is displaying a list of files is because it is unable to find the functions required to make the gallery work. Second mistake you have made is with this line of code:
Well, I don't know if correcting that error will fix your original error, but I do know that "plog-admin-function.php" should be chmod "644" so that you have full read permissions but only write permissions for owner. That does make me wonder though. You should check and make sure that all your files and folder do have the correct permissions. All the files within a theme should be chmod "644" including the images located in the "images" folder, but the "images" folder itself is chmod "755". I hope this helps.