Why is my animated with Mecanim character (enemy) not visible in game (play) mode?

Here is the screenshot. I did it after exporting the game. All my enemies are invisible in this game. You see the red crosshair and the slight Halo around the enemy that is going towards me.

Shader? But why the enemies are invisible only sometimes? And even only a part of enemies are invisible. Remember that all my enemies are from one prefab. They are the copies of one character. If shader or renderer were a problem, that strange situation happened all the time or for all my enemies.

@$$anonymous$$za could you be a bit more specific (even post code) with what you are doing. There are so many ways things can "become invisible". Is the mesh renderer perhaps inactive?

I thought I gave a lot of details, but O$$anonymous$$! I'll try to be more specific. This situation is hard for me and I knew it would be so for you too. I'm not surprised that it will be hard to find any solution (except for restarting Unity of course). Every time I start Unity, the conditions of my game are the same. And sometimes my enemies aren't visible. I do nothing what can cause such a strange behavior. It's independent of whatever I'm doing. It's not a big problem for me -- I just restart Unity and everything is O$$anonymous$$. But I'm just curious. I'm trying to understand this situation. I think it isn't my fault (my code or something). It's a problem co$$anonymous$$g from Unity. Enemies are instantiated at the beginning of the game with a script. It's a normal script -- nothing strange in it. Really! Believe me. But even not instantiated characters (I did that for testing purposes) behave in this way. Strange! So it's not a problem connected with the instantiating script. The character prefab has animation (walking and dying)run in $$anonymous$$ecanim. It's driven by script -- nothing strange too. I don't think the scripts are problem. They are tested very well.

Now I have some idea -- maybe my laptop is too weak to run the game, and it just not rendering the enemies or all enemies (30 enemies instantiated at the beginning of my game; they all animated and many other things). 2 GB RA$$anonymous$$, XP, Procesor x86 Family 6 $$anonymous$$odel 15 Stepping 13 GenuineIntel ~1795 $$anonymous$$hz, Core 2, 384 $$anonymous$$B $$anonymous$$emory of Video Adapter. It can be a problem because sometimes Unity has problems with running my game. When I export, it's much better. I lightmapped but my game still need much resources. I have a lot of grass, etc.

What do you think? Thanks in advance for your opinions.

Do you have occlusion culling enabled? Can you see the enemies if you go back to scene view (does it only happen in the game view)?

If your laptop were too weak to run it, then either Unity would crash (out of memory) or you would get terrible framerate. Unity doesn't occlude objects randomly to save memory