In an attempt to find out...(I thought I knew how). I ticked the box and I now also would like to know how you can reset this. One would have thought it would be in the text - options menu...I couldn't figure it out sorry Mosh...DOH!
I Figured it out Mosh you have to go to the tools - options - workspace - warnings. You should notice that the paste and importing text warning will be un-ticked...tick it again and your away.
Hope that helps.
Josh