Why aren't my mesh appearing inside a viewport frame?

[professor26 (rip_Catto)]

                                                                     20/01/2012

I am using viewport frames inside my game’s character customization, but I found a few mistakes that I not sure how to fix. I wish if any of you could help me with fixing this problem. Thank you.

1. It usually should be like this.
   Eg :
   

   

2. But after that, I found out some problems, which the viewport frame doesn’t show specific mesh.
   Eg :
   

   

Please send me some bits of help if any of you could.

professor26
Roblox Developer