I've noticed that in Cold Glider's video, when he looked to glyph he got that Checkpoint... Done thing. Though there were enemy presence. But could that still be somekind of mark that indicates you have triggered the Glyph and something has happened? 'Cause I got this Checkpoint... Done while watching one of these Glyphs at district 6, if I remember right, where is one dead Elite and few Glyphs. Of course, there were also enemy presence, but they were attacking all the time, and I usually don't get checkpoints when I'm under an attack. I haven't found any new doors opened after looking to that Glyph, but I didn't have much time to check out whole city, so I guess there could be little chance, that this Glyph triggers something.
And I'm so sorry 'cause I don't have any pictures to you guys.