But the problem happens on Win10 Pro 64-bit and Win10 Home 64-bit. Also, before I posted this morning I had tried uninstalling and re-installing, and I had tried unchecking the shell options in settings inside 7-zip, applying the changes, and then re-setting them ON and again applying the changes, but that did not help. Basically I can replicate the problem at will on any Win10 64-bit (we use Classic Shell on Win10, by the way, just to ensure you have everything, and we are on Build 1809 - ).