Hi Gaël,
This problem should be fixed after installing the appropriate v5.4.1.00 installation package for your hardware from the UofL website:
https://www.astro.louisville.edu/software/astroimagej/installation_packagesNote: Using the update feature within AIJ will not resolve the problem. You must perform a new installation using the appropriate dmg file from the install package website. After the new install is performed, you can again use the update feature for future updates.
Please let us know whether this fixes the problem on your computers.
Karen