Allegro: DRC showing RED but no reported errors?

[Pack34]

I can go to TOOLS>UPDATE DRC and the DRC status bar is red. However, if I go to TOOLS>REPORTS and select the DRC Report and the Unconnected Pins report they both show no errors. I will note that this started happening after I switched from mm to mils.

Any ideas on what report I could run to find out why it's showing as RED?

[Alex Eisenhut]

What do you call the "DRC status bar"?
There are many sources of DRC. Go to setup->constraints->modes to see what's on or off.
Display->color, go to stack-up, there are drc layers here too.

display->status, this is the best place to look for errors: you can click on update DRC here and you can see sources of errors too.

The secret of the status is that the little colored squares are buttons you can click on... Not obvious. What do they show?