I just found out that if you have a non-rectangular viewport (shaped like an 'L') and you want to move some text to fit inside the open space created by the 'L' viewport, make sure you don't have running osnaps on, or it could snap to a line in model space still, and put it somewhere off the sheet. It just happened to me, and I was like "What the.....?? Where did my notes go?". Once I tried to move them again, while zoomed out this time, I saw the markers of the osnaps snapping to the end point of some grid lines that would shoot them out side the title block.
