Background tile loss when game restarts

I have a game I am working on that I had a cobblestone background tile for. I then made a health bar system that went down when I pressed “=” (for testing purposes). Later, I decided to change some of the background tiles to a different texture, but when I depleted the health bar and the game reset, I lost the new block entirely, and cobblestone filled it in. It may be because I had my testing account open in a different tab, but I’m not sure.

Yeah, different accounts active simultaneously interfere with your work since flowlab can only handle one account under the same computer at a time. I believe the account that has been signed into more recently takes over.