Finding Appended materials

Hi guys!I have a file with materials for cycles render that i wish to add to another cycles material .blend file;this one is in the Matlib addon folder and i want to update it with these other materials; i opened the matlib blend file and appended the ones i want to add but when i do i can’t find them anywhere.
Is there something i did wrong or what?

The material data blocks are available to you, you just need to select the material you want to use from the material list

But they don’t show in material library VX when i update…if i select them from the list the nodes are gone