Interesting. That doesn't sound like what happened to me. In my case, they showed up in the Attachments window, but were listed as being of size 0 bytes, and they did not show up in the notes of the actions (though the paperclip icon was present, indicating that there was an attachment).
In your Applications folder, there's a folder called Utilities, and inside is an application called Console. If you run it, you can click on various choices in the sidebar to see debug and error output from the software running on your computer. Type OmniFocus into the search field at upper right to show only messages from OmniFocus. Make contact with your inner Unix geek :-)