AirCrade

It seems that I have the same problem but in my case, when I try to sign in, the Xbox Live crashes and it instantly take me back to the MCPE title screen. When I try to sign in again, it did the same thing. I hope that anyone have the solution on this problem.

Looks like my crashed worlds doesnt have a level.dat_old-file. It just says level.dat. And when is this problem's gonna fixed? I hope u make it quick cos i dont want to leave mcpe. =)

A little update, i've updated my mcpe to 0.13.0 and now it crashes instead of turning into green screen

So to u mojang staff, plzzz repair this "bug" as quick as possible cos i wont be able to live with my best survival world be left unopened for a month :3

I,d like to report bout this bug too. Apparently, this bug only appears on worlds that have been played for a long time(the worlds that have more mb used). And it appears on mod-used worlds too(back then i used mods too but now i don't cos of the bug). And my mcpe version now is 0.12.3 (the latest official mcpe version). So hope this helps and hopefully u can fix this bug as quickly as possible. 🙂