I don't think it was just because last week was crowded. We were there in October when the crowds weren't that bad and we had MDE issues too. It was sporadic- sometimes it worked fine- other times it was glitchy or did not work at all in the parks. It was fine outside of the parks- such as in the resort areas. I will say though that this was our 3rd trip since MDE was in use and while it still was inconsistent- it was far better this trip than during our last two trips when it was down or glitching more than it worked. The glitches and failures still happened, but at a much lower rate than our previous trips in which MDE was pretty much useless other than to totally mess up your FP+ if you attempted to change them (that's a whole other story). So while it still has issues, it is improved. I did love the fact that photopass photos show up in MDE very quickly- usually the same day. We were able to determine the day of that we had lost photos- we had 2 sets from the same photographer as DD had the wonderful magical moment of playing with the stepsisters, then riding the carousel with the stepmother, and then going over to get in line for pictures with them- we had the meet and greet photos, but the ones of her playing with them and riding the carousel were lost. We went to the photopass counter before leaving MK and they were able to locate most of them and load them onto our account. We lost a few which they thought was probably because his camera was not fully online and working for the first photos he took, but we got some pretty special ones back!