In my post from Tuesday, August 17 (a few days ago) I mentioned that security concerns keep me from using the Emerald viewer to access Second Life. It wasn't the place to go into details, nor is this post, but in summary, I stopped making frequent use of the Emerald viewer some time ago after one of the developers that I know told me about a major inventory loss that they traced back to the viewer itself.
Now, it appears that the viewer has been used for a Denial of Service attack. Read more about it here. A few people I know are uninstalling the viewer and switching to various others. Including me.