Fretboard diagram anomalies with MS3 3.0.4.5763

I am puzzling over two behaviors that surprise me. In the following example, I've added two fretboard diagrams.

1. Both diagrams have been set to manual placement with a Y offset of -2.5. A blank diagram starts at the position on the right. The diagram hops up (a half space?) when I add any dots to it.

2. When I add dots to the blank diagram, or indeed to any string, a circle appears above the string, as shown in the left diagram. I must manually clear each circle (by cycling through circle, X, blank). There is of course no situation where one would want both a dot on a fret and a circle above the string, so this is presumably a bug.

Finally, as I've mentioned before, I never (well, very rarely) want to use a circle or X above any of my diagrams. I use a different diagram style. In my ideal world, I would be able to turn off their automatic appearance (i.e. the default behavior wherein clearing a dot causes a circle to be displayed above the string). That behavior adds a lot of edit time to my scores. Just in case this has been implemented and I haven't spotted it, can someone confirm that there's no way to do this?