I tried many ways to email doubleclick privately about this but it seems impossible so I'm posting here.

A recent change to doubleclick is causing broken HTML to be sent to browsers. The syntax errors seem to cause (at least) all searchforce.net to be broken.

Here's how you can see for yourself:

1. wget "http://fls.doubleclick.net/activityi;src=3210569;type=count924;cat=quick255;ord=3154327529482.5435?"

2. search for two double-quotes in a row. You should see the problem - your page is littered with errors like this:

... <snip>

<div id=""sf_fl_content""></div>

<script type=""text/javascript"" language=""Javascript"" src=""//sftrack.searchforce.net/SFConversionTracking/CTCommon.js""></script>

<script type=""text/javascript"" language=""Javascript"">

SFCookie.include();

...

CTCommon.js isn't loading and SFCookie.include() fails.