I took a break from my project and now when I return something extremely odd is happening.All objects with a rigidbody simply disappear when I hit play… even from the hierarchy. I don’t have any scripts that are doing this… is there some kind of option in Unity that may have been turned on that is causing this? I know this wasn’t happening when I left off from my project.
It is also the case when the game is built.
Any help appreciated. I really can’t begin to think what this is.
In every scene with that project? Even new ones?
Yep… I’m gonna try a fresh install of Unity.
That fixed it… if someone could enlighten me as to what that could have possibly been… I’d appreciate it.
Your scene possibly got corrupted. Ive seen some/heard of some odd behaviour around corrupted scenes.
had the same issue, changed some parameters in rigidbody nd it got fixed 
no idea why
Glad you sorted your issue, whatever it was but please don’t necro posts like this. This post was made nearly 9 years ago.