[My avatar will fully rez but why can i not see anyone else's skin? everyone else's skin is grey]

thank you both so much i understand much better now how to move forward.. thank you

[My avatar will fully rez but why can i not see anyone else's skin? everyone else's skin is grey]

my avatar fully rez's mesh rez's for me and all but i can not see any other avatars skin i only see grey,  i can see the colors of their clothing, but i can not see their skin what so ever... on any other avatar at all . it is very miserable world to live in when you can not see anyone and everyone around you is a grey zombie ...PLEASE HELP ME!

comp specs:

MacBook Pro

15-inch  2.4/2.2GHz

Processor  2.2 GHz Intel Core 2 Duo

Memory  4 GB 667 MHz DDR2 SDRAM

Graphics  NVIDIA GeForce 8600M GT 128 MB

Software  OS X 10.9.1