I was in the middle of a 2D floorplan, after importing furniture from 3D warehouse, my selection tool stopped working when double clicking on grouped items. Figuring the furniture was too much, I removed it all, quit sketchup, restarted my computer and it is still not working.
I am newer to SU but was doing just fine when this quit.
Using SketchUp Pro 2024, fully updated on MacBook Pro, OS Sonoma 14.5
Could you share the .skp file so we can see if it’s something specific to the file? It probably isn’t but it’s hard to say from just your screen capture video.
I ended up deleting the dining tables which I had brought in and it solved the problem. I think when my select tool was lagging and de-selecting on the right click, I inadvertently grouped too much. After deleting the tables, everything worked fine again. (30 seconds after I posted of course!)