Problems with linetype in Layers

New to autocad.

Autocad 12 for Mac.

I setup several layers, each with a different color and line type. real simple, just like the book.

I select the first layer in the Layers pallet 

the color changes and the line type is continuous.

i select the second layer, and the color changes

but the line type remains continuoius; when linetype was created, it was set to hidden.

i change the linetype in the properties inspector to hidden for the second layer.

i select the third line type that was set to center linetype, but now the properties inspector says line type is 'hidden'

any layer i select shows line type as hidden now.

In the 'show layer list' when i select a different layer, the properties inspector displays the correct line type.

but when i select in the layers pallet, the line type does not change.

i exit autocad and start over, but same thing. 

am i doint something wrong????

Francis

don't konw what to look for???