I've just installed Blender 4.3 and there seems to be some kind of problem with keyboard response while in Object Mode. Basically Blender doesn't respond to any key presses while in Object mode. The odd thing is that when I switch to Edit Mode the keyboard works just fine. If I switch back to Object mode I don't have a keyboard anymore, which is totally weird. If you've installed 4.3 do you have the same issue?
I have reported this as a bug.