I have tried to reproduce this issue in ARCHICAD 20 with the latest build, and with the selection area method, the arc is selected even if the arc center is not selected. Are you still getting this problem? Thanks, k
Partial selection is working fine - even though it can be annoying when you select a centre point without realizing.
It is the entire selection is the problem - especially with very short but large radius arcs.
The centre may be off the screen or some distance away so if not included in the selection area will not allow the arc to be selected.
Logical I guess but annoying.
Personally I just SHIFT click on the arc to add it to the selection.
The change happened back in version 18.
In 17 and before the centre of the arc was basically ignored in partial and entire selections.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10