Greetings, Blender Practitioners!
I was doing some UV unwrapping of a particularly complex mesh, and methodically projecting faces from Top, Front, and Side views (respectively) to avoid distortion from the typical UV unwrap. I have UV/ Image Editor open in a second pane, so I can selectively pin my vertices in place as I go, in preparation for when I ultimately bake the textures (still working on the ‘best’ way to get a texture to look seamless!) and I am presented with a thin red/pink circle instead of a cursor.
No amount of restarting, clicking on boxes, or issuing other commands (grab, scale, box, etc) will rid me of this seemingly useless feature. It appears to be a cross between proportional editing and mark seam, from a visual standpoint. I would be amused to find out its intended use, but more than that, how to turn it off! If I left-click on a section of faces, it will stretch them out of place. Not helpful.