After updating to Unity 5.2.1 I noticed that all the colliders in my project were now black. This also happens with custom gizmos.
I tried downgrading Unity but it didn’t fix it.
I created a new project and everything looked just fine, so the issue must be within my project. Is there any way of maybe cleaning up the project to fix this?
After reading your question i searched for the reason why it is like this…But i found that some one has rainbow color,white color like that. So its a bug…may be send that to bug reports.
Check this forum thread 1.