I was seeing them in the Android app and the previews in UI3, but that went away after updating to 5.2.8.2.
Here's what I found playing with these two settings with 5.2.8.2 on the BI console playback (I don't know what the behaviour was before this version, didn't get around to playing with it until now):
1. "Add motion overlays from direct-to-disc BVR"
2. "Add text/graphic overlays from direct-to-disc BVR"
I do not have any text/graphic overlays configured in BI on any cameras, all overlays are being done by the cameras themselves. Some cameras have the trigger highlight option enabled, some don't.
1 On, 2 On, I see rectangles for all motion captures, even the cameras that don't have it enabled in the trigger menu.
1 On, 2 Off, no rectangles at all, even for the cameras that have it enabled.
1 Off, 2 On, no rectangles at all, even for the cameras that have it enabled.
Since other have already reported it and it doesn't bother me, I'll wait and see how it shakes out.