Help please. I have a drawing that has a group of dynamic blocks in it. I have these blocks in my tool palette. Up until now I have had everything in centimeter units. That is, the blocks are drawn in centimeter units, and they insert that way into a centimeter drawing. I just made a couple of new blocks in this same block drawing, and for some reason they are inserting in millimeter units. I cannot find where to change this. If I look at the properties of these blocks, I can see that they are indeed in millimeter block units, but that line is grayed out, and I cannot change it.