First of all apologies for my last post. Looks as though Navis isnt the problem.
When i created devices in the past i would make the 2D block on layer 0 and bylayer. The 3D block would be also on layer 0 but forced to the colours that i wanted to see.
We have upgraded to 2010 and when the devices are viewed in isometric they all come out the same colour as the layer they are inserted on.
The only exception to this is when a block is in a block ( i know.... not good practice) but was discovered when a draftsman made a mistake.
Can anybody help me? Have hundreds of devices and will take too long to remake them.