Materials organisation in macosX+ bug

[messire]

SU7 / Mac OSX
Am having a trouble with materials:
editing a material, loading an image #1, then applying it on a face
When i edit and remove the image, change for a new one (#2), the texture keeps applying #1 despite purge unused etc...any hint

Second question: I want to get rid of all SU preset materials to create my own with my folders etc...where are the original folders stored in mac os ( cant find them) and where shall i copy /create my own..? its mysterious !

thnx
N

[matthew.robert]

For the second question:
Library -> Application Support -> Google SketchUp 7 -> SketchUp -> Materials

I don't quite understand the first question, can you reword or perhaps include a few screen shots to aid the description of the issue?

Cheers,
Matt