While I was attempting to Solo Flawless Prophecy, I got past the Desert area, going to the second encounter, but while I was in the purple hallway, the door to the 2nd encounter cube room wouldn't open. I tried going back to Heaven/Hell area, but that door wouldn't open either. So I was stuck in the purple hallway. I was able to get past the Cube Room door after boosting right when I was transitioning through the loading zone, but I was stuck in the room where the final bosses appear, I wasn't able to get to the normal starting room. The doors wouldn't let me back into the purple hallway, and I couldn't start the encounter. So, I just went to orbit, unable to continue at all.