problems placing fiducials manually with mne.gui.coregistration

Dear all,

I’ve encountered a problem that was described in a post from 2022: Coregistration: Placing fiducials manually?
when using the coregistration gui in mne python 1.6.1. I can not place the fiducials manually when clicking on the head surface to place the fiducial there. It just seems like the RPA is moving randomly around when it’s selected. But it doesn’t move to the place where I want it to be.

I’m using mne python 1.6.1 on macOS-10.16.

Help would be appreciated.