X6 bug? - Current cad layer keeps changing back after i set it

[sean83]

I upgraded to X6 on Wednesday and may not have my head around it yet, but what is happening is i click the 'CAD' (current cad layer) icon and set my cad layer. After a couple of minutes the current cad layer then reverts back to a layer i have called 'Driveway' I don't know if i'm setting the cad layer incorrectly or it's a bug. I'm finding it a little annoying that after i set the layer i can draw cad lines for a few minutes, then the current layer then changes to this layer.
No matter what layer i set it is always changing back to 'driveway' layer. I use the 'driveway' layer to draw the outline of my driveway in the site plan set.
Anyone else had this problem? Or am i doing something wrong setting my cad layer?