pcb - Show Pad Nets Seemingly Not Working in Altium

For some reason, the PCB is not showing net names on the pads

I have all connections (rats nests) visible I have checked the "Show Pad Nets" and "Show Via Nets" under the View Configurations > View Options Panel

I have checked layer colors and everything is on

What other setting might there be which is preventing the net names from displaying within the pads/vias on the PCB layout?

I am running AD15 on Windows 8.1 and this is really bugging me!

This is an example screen shot of the PCB environment, you can see that despite the option for "show pad nets" being enabled, they are not showing.

Thanks for the help

This question is not the same as another related question "Show Pads with their Name on PCB altium " which discussed adding silkscreen designators. It is about why the Altium feature "show pad nets" does not seem to be working to show the 'virtual' net names in the PCB tool within the pads