When trying to register an app with Twitter just now, I got the tremendously helpful "something went wrong" error page. I went back and tried to re-submit, and got the "app name is already registered" message. I couldn't figure out how to list my registered apps, so I registered the app under a slightly modified name. It worked that time, and then I saw the link to list my apps. Turns out the first registration actually DID work, so now I have two of them.
So, how do I UN-register an app? Thanks - Michael
