(In reply to Larry Rainey from comment #5) > Do you have the extension pack installed? > > It has to be installed without virtualbox running or funny things happen. Hi Larry, no, I had never installed the extension pack. I just checked one other machine I have, which was installed ~1 year ago (the machine is up-to-date). Here the window is not showing up at every startup of VirtualBox. Also here: no ext pack installed