Red folder name in Instances list?

Dumb question time…

In DT 3.5, Info Inspector pane (little “I” icon) near the bottom is an “instances” drop-down so you can see the paths to all instances in the database. Sometimes the last item in the list is red, but I’ve never managed to figure out what this means…

Anyone know? Yes I read through the docs, but didn’t find anything.

Red enclosing groups are replicated.