Thanks all who has been contributing to this.
Perhaps good to mention that I upgraded to Archicad25 late last week and only noticed the issue early this week.
All the models and hotlinks worked fine in Archicad24, so I back-saved the models to Archicad24 and everything seems to work fine now.
I have contacted our supplier of Archicad and I've sent all the files to Graphisoft.
In the meanwhile, we will continue in Archicad24 as the hotlinks seem to work in this version.
ArchiCAD24 - since Nov 2020
Revit - 2005 to 2020
Windows 10 Pro
2 screens: nvidia quadro RTX 4000