Dave, this isn't something I've heard of before. Can you let us know what browser (including version) you're using, as well as what OS you have installed?
Screenshots of what you're seeing (via the paperclip button in the post editor) would also be helpful.
If it's more convenient, you're also welcome to send the info/images to
support@omnigroup.com. We'll be happy to take a look. Sorry for the trouble!