Can't get a face

Does anyone know why I would not be able to get a face when clicking on a surface 3 times:

I’m trying to get rid of the vertical line on the side of this road exit so i can slope it down 4’ to meet the X-street adjacent (the imagery is actually not the right street’ THAT ought ot be part of an overhead highway, but one problem at a time…).
Nothing is locked, and I was able to slope down the sidewalk running alongside:

But I can’t get either the line of the vertical face behind it to start my manipulation.

What to do?

P.S. I’m also using Placemaker to get the imagery. This seems to add some overhead, but I’m still surprised it became so much slower than the main model which is 10X bigger (~ 540MB)

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