Well, I was trying to publish a post for the last couple of days to no avail. We've recently replaced our PC and I added it to the list of things that weren't working since the switch. There were more important things to be corrected, but today I began researching and lo and behold I'm not the only one. If you've upgraded to Internet Explorer 9, chances are good you won't be able to publish either.
So, I switched to Google Chrome and all is well.