We have just switched from ACAD LT 2000i to Inventor Suite 2008 and its color pallet is a bit different (ie.. white is white not black or white depending on background) so everything on the zero layer in LT was set to white by default which never posed a problem since if you did use a white background what ever was on the zero layer would be black. 
 
Confused yet??  Hope not.
 
In ACADMech this is not the case.  Is there a way to have ACADMech automaticly convert that layer when ever I open a drawing? It is really getting to be a time consuming pain to change just that one layer.