MonoDevelop Insert Mode always on?

I've updated to the latest versions of MonoTouch and MonoDevelop.

I can't seem to highlight ensure rows of text at a time by using the shift key + up/down arrows. I've also noticed that "--INSERT--" appears in the bottom left status bar. The开发者_StackOverflow社区 cursor is also a box instead of the usually single line.

I'm using a mac book pro, so there is no insert key, and pressing fn + return doesn't seem to have any effect.

How do I turn insert mode on and off?

I've also noticed that it sometimes says "--VISUAL--", but I can't find any links when I google these tiems.

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You've enabled vi mode. Turn it off in MD preferences.