Try going to View > Nets, add the net to the View List, check the box for Traces plus the following Unroutes, set the View Unroute Details radio button to All.
Hi, thanks for the advice. Unfortunately even after doing this the unroutes are still "behind" the copper area and are therefore invisible unless I remove it.
OK - so the ratsnest is still there - however hidden behind the copper?
As far as I can see the ratsnest it shown behind all copper items such as pads, vias traces, copper and so on.
I don't think it is possible to change the display order to make the ratsnest show on top.
The only solution I can think of is to use Display Colors to turn off copper, or to use 'SPO' command (for split planes).
You may also be able to use the 'T' modeless command to make the view transparent.
Thanks! The transparent mode works the best for me. I dislike turning off the copper in many situations since it is nice to see what is underneath when routing.