Weird Xcode delete/backspace bug started yesterday/today?

Anybody find that xcode is adding a new line to you source code when you hit the backspace key?

For example I am writing code and I make a typo and I hit back space it will the immediately duplicate the line of code the cursor is on and it will appear below, and back space will delete on eac开发者_运维技巧h line char by char as it hit the key?

Example

NSNumbwer

I see the typo and start hitting backspace

That line becomes

NSNumbwe NSNumbw

Those 2 lines. It seems to be visual only as they 2nd line doesn't actually exist in the code.

Only started today. Friend said it started for him yesterday.

Anybody got clues as to what is going on? Thanks -Code

Have you tried turning it off and back on again?

EDIT (Real Answer)

Have you tried reinstalling Xcode and or the iOS SDK?