My World Simply does not save

Whenever I click save and quit, the computer does a show of saving files without doing anything.

In one world, I spawn in the same spot (That spot isn't even a spawn point) with a command block and a mansion. I could blow up the whole mansion, save and quit, and then comeback to a completely unfazed mansion that I could blow up again... sounds like fun right? But I sorta need this map to save some command blocks so I can play hide and seek without adding the command manually every time I load.

Please help, and Thanks in advance.