disappearing objects

i hope someone can help me,i dont know much about unity but i have used it before with not many problems,the only thing i have put in my scene was a plane and whenever i add more objects like a cub and i press play it disappears,anything that i add disappears for some reason.Is anyone having this problem and do you think its this version?

 

Are you sure your camera is pointed at the right place? Check the Game view (rather than Scene view) to preview what the camera is looking at.

 

its pointed at the objects and tried everything,but as soon as i press play they just disappear no matter what i do.I messed with the camera clipping and nothing.

 

I'd check the layer the objects are on and if they are selected under the camera's culling mask.

 

Do they have rigidbodies? Maybe they're falling? Do they disappear from the hierarchy or just from view?

 

i think i have the layers the same,im not so sure since i dont know much about unity lol.

no rigid bodies,its just a regular cube,once i press play it just disappears

 

Again, does it disappear from the hierarchy? Or just the camera?

 

it disappears from the hierarchy and the camera