Well, the patch didn't fix it. I was having this problem last night.
My Roamio "hangs" on a black screen when it transitions from HDUI to the old SD UI. You have to press a button to get it to draw the screen. I don't know if it was the Roamio update or the Xbox update, because they both happened at about the same time, but it didn't start until I had both of those updates.
Current: TiVo HD w/lifetime, 2 x 2 Tuner Premieres
Former: S1, S2 TiVos, UltimateTV, SD DirecTiVo (x3), SA 8300HD w/Passport Echo, DirecTV HR-24 (x2) , DISH 722k, DirecTV Genie + 2 mini