Bug Background goes to black and it duplicates everything that moves.

Everything is not working when I build my game it doesn't work properly. In the editor, it worked perfectly but in the program, it didn't and the background went black completely (it's normally gray) and it duplicated like CRAZY Please respond to help me. Respond before March 29 cause I am publishing the game on that date. Thank you for reading this message.

 

Check your camera clear flags.
In the editor unity has a option by default to clear the screen for you but in the build you need to have to set the clear flags on your camera correctly to get it working.

 

You say it is a build problem only. What is the target platform, and what do the player logs say?

That's insanity. How are you only a couple days from release, but only now doing actual build testing? That close to release you should be all done testing everything in your build and working on some minor details, not just starting to investigate obvious release blockers.

 

This is old but I am answering this because it is the first hit you find when searching this question. I had the same problem and it seems to be caused by having the camera background type set to skybox without having a proper skybox applied, I fixed it by setting the background type to solid color which was applicable to my game.