This morning I discovered I could enter code to VS but couldn't backspace over it.  This would require me to code perfectly the first time, and for me that's a non-starter.  It turns out that none of the command buttons work.  The short story on the fix for this oddity is to either disable Auto-Hide or open one of the hidden windows, then click the X to close.  More info at the msdn blog site: Tabs, Backspace, Delete and other commands not working in the editor.