I tried re-installing with the browser open, did the about:settings bit, uninstalled, closed browser, opened browser, re-installed, nothing. Been like this a few days, now. A few months ago, VDH on both my machines decided they didn't really need to download image galleries, but had been ripping streams okay. Not the icon really is completely gone, I can't even find the "secret" one in the "tools" drop down, which is there when it disappears from the toolbar. I am going to check the status of VDH on my XP box I still have running. It stopped DLing galleries too, but was doing streams, last I was aware.