Couple bugs/issues here:
1. Editing a existing bookmark seems to create a copy (like editing convenience keys). In this case, I had it set to launch a URL. I modified the actual URL.
2. It requires you to set the protocol in a url ie: "http://". Can you make it automatically assume "http://"? Alternatively, you could pre-populate the field with that.
3. I went back in to the "Home Screen Bookmarks" section of the app to delete my duplicate shortcut. It just sits at "Loading" with an empty list now. I can still load the menu, but the options don't do anything at this point.