Apparently this can occur if you hit the : key, in fact it's happening to me right now. I was able to fix it on my last thread by toggling the HTML mode on and off while it was active, but now it's not working anymore. So I'm at a loss.
I'm trying to write up a thread on the General Discussions board, but every time I type something, I get this weird drop down menu showing up:
I notice, though, that it's not showing up on this post.
What is this and how do I make it go away?