When creating a new layer and changing its color, you may sometimes find that the color change is not applied as expected.
This can happen when you change the layer color while you are still in the editing mode for the layer name.
In this scenario, two pieces of information (the change of the layer name, and the change of the layer color) are sent to AutoCAD exactly at the same time.
On fast machines, this is not a problem, but on older machines that cannot compute the information as quickly, it can happen that only the first piece of the change (the change of layer name) is actually applied.
Our development team is looking into this already. In the mean time, if you run into this issue, you can work around it by making sure that you let the change of the layer name complete (just click once outside the layer name field) before changing the layer color.