[Theophilus]

I also had this problem, and rtebiz, you are right on the mark. The conflict was with a Markdown plug-in. I removed the plug-in from the Plug-Ins folder in my Application Support/Omnioutliner file, then quit and restarted Omnioutliner, and I was back in business with opening old MORE files. I have hundreds of MORE files, so this was a big deal. Thanks for the heads up!