I first noticed this while in my Yahoo email, when I clicked on a jpg attachment. The FRAME of the secondary browser popped up (as in "empty picture frame....just the four sides with the address bar along the top) but never finished loading, and never went anywhere. I thought it might be an isolated Yahoo problem, but it wasn't. In exploring the problem, I found that no clickable link anywhere will complete the "opening a new browser" process. Not on any website, not from within an email message in my outlook.
I thought it might be a popup blocker problem. I uninstalled the Google toolbar. I uninstalled my Ad-Aware Ad-watch program. I even uninstalled my Norton. Nothing helped.
I even re-loaded my entire IE. Again......no help.