Thanks everyone.
It's a minor issue, and I can live with it. But I thought I'd mention it, since it was me that brought up the related earlier issue with LoMaps.
I'd used V3 in all my OAM maps up till now, but thought I'd try V4, because theoretically newer is better, right? Now I'm not so sure. So V3 uses menion turbo-optimized-code and V4 uses off-the-shelf code? I see V4 gives far fewer theme options, but at least the matching Elements/Elevate are there.