For awhile I was unable to take sreenshots on style boutique 2 and i even posted in this forum with no solution in site. I was pressing all the butons I could think of even resorted to taking pictures of the SD Card. To take screenshots on style boutique 2 now all you need to do is press the Y Button and not the two back buttons anymore, the reason for this is probably due to an update.
Though i would post this to help others that may have the same problem.