Scale Dependent Layer Visibility Not Staying Light Gray

[MaryEllen_Perko]

Hi.  I love the March addition of showing scale dependent visibility in services added to a web map; that is, where layers that aren't visible are shown in a lighter gray.  However, when I add a second service to my web map, non-visible layers no longer show up in the light gray. Is this expected behavior?  Is it just me, my browser, a coincidence?

Any help is appreciated.

Single map service in web map:

Two services in web map (no change in extent):

Thanks.

EDIT:  I've noticed that the above seems to only occur when adding layers to the web map.  If I save the map and open it later, the layers that aren't visible are gray as expected.  Thanks.