Windows 7, I don’t have any special add-ons running in the background other than the usual Flash. Something else I just noticed. It doesn’t seem to like Adobe Acrobat Pro. In other browsers, if you click a .pdf link, it will open in Acrobat Pro. With version 4, it doesn’t recognize Pro as a replacement for Adobe Reader and just gives an error message.
I finally gave up on Adobe; too bloated and too many problems. I’m using PDF-XChange Viewer and am very happy with it.
That’s an acrobat issue. Re-install acrobat and you’ll be fine.