I can't recall now, but when I opened the editor later and filled in all the data, it gave me again couple of errors but I managed to fix them and publish. I guess it had to do with latin-2 characters in tags. BTW are you planning to add the possibility to upload images from local storage? The other things which maybe could be implemented as well: an alternative form of authorization as sending  posting key to the third party may be not what some people like to do and it would be nice to have the possibility to re-edit published posts. This would make it a great editor, I think.