Xbox Guide isn't functional when you play Xbox 1 games either. Also: 2.40 Broke my Ps3 - PLAYSTATION®3 General - PlayStation.com Forums

Wow. I'm glad you guys' ones are working, but I'm not updating mine 'til I hear that this is fixed. The chances of it happenning seem to be higher than I'd like. I'm not particularly willing to have to reformat my drive and lose all my stuff (also too lazy to back 'em up, got better things to do) if it happens to me.