I'm one of the unlucky feller who encounter this problem Description of the problem:  You can received messages from a empty room which you LEFT previously or whatever\   BUT you cannot post anything as the room is empty How to solve this problem: as there is no way to contact LINE for now ... there is only one solution.. First you have to go to line profile setting : For ANDROID:  More--> settings--> Profile now click DELETE MY ACCOUNT yes , you have to delete it. then you will be logged out it doesn't matter if your accounted is bind with email it will be wipe start LINE again , follow the instruction to register again