Just noting since I used it to interact more with user created content especially on Aggie Football forum.

if you are running any content blockers or ad blockers I would try temporarily disabling those and seeing if it changes anything

To confirm: 1Blocker was blocking ads and disabling that function permitted an ad then a dark bar with slightly shorter height than the light gray bar "behind it." So the dark separator that worked fine with 1Blocker on has been updated with a bevel…and only appears with 1Blocker ad blocking set to disabled. Sound right from a UX/UXD intention?

probably not intentional. however, running extensions that modify/remove portions of our site is not a use-case we generally provide support for