I've had a couple of reports from users having problems with Little Pork Chop on Sunday evening. If you're having trouble too, and want to help get to the bottom of it, here's what you should do:
Reload the LPC page. This is the equivalent of quitting and relaunching an app in a desktop OS.
Try logging off Twitter and log back on. It's possible a token expired, if so, this will fix that.
If you're still having problems, and don't mind getting a little technical, open the browser's Console window, and if you see error messages, after failing to get a tweetstorm published, take a screen shot and post them here as a comment. That will help nail down the problem. Here's what such a screen shot might look like (without the errors).