After running discovery, the correct host list appears on the status of discovery page, and the matrix of checks is filled in correctly with data you can hover over, but the background color is not set so the matrix appears empty.

I moved a 2.4.6rc1 database to this new system and upgraded as opposed to a fresh install if that is relevant.

In a quick look in 2.4.6rc1 the background color is set from td.active, but there's no background color bubbling up from any class that I can see in 2.5 for the class=active. I've tried both dark and blue.