Click on the + (plus sign) to add a set point then click on the clock dial. I put mine around noon, but I don't think this is the issue.
The issue is the basemapz are below the surface and are invisible.
Press the F9 key to show the grid instead.
See if this works. It's been ages since I've done this, and it's taking me a bit to figure out the problem, which is really simple, really.