No,but I found the same thing happening when I went to download an app and I hit back to go to the previous screen. I just ended up hitting the home button to go back to the dashboard and it was fine. I think a lot of the bugs will get ironed out in the first update (after the initial update).
Don't worry about this too much. It's been put out that there are going to be allow of glitches due to late changes in the software following concerns from the public (Kinect, always on, etc.). That said there are suppose to be a lot of patches issued to handle these - give it a little while.