Next Update will make old Lounge saves uncompatible with newer build that's coming out soon. (14)
This is required to change how the Lounge gets saved and loaded. New format decreases the size of Lounges almost by 6 times. This will make loading into Lounges way faster and general loading faster.
There's also some other good stuff coming in the update, one of which is super-wanted feature by the community... good 'ol CTRL + Z