The workaround

workaround.html

Take your tag that looks like this:

<script language="JavaScript" src="http://ad.doubleclick.net/N4206/adj/rmm.usnews/prairieview_cc_wichitahutchinson_300x250vid;sz=300x250;ord=[timestamp]?" type="text/javascript"></script>
    <noscript><a href="http://ad.doubleclick.net/N4206/jump/rmm.usnews/prairieview_cc_wichitahutchinson_300x250vid;sz=300x250;ord=[timestamp]?"
    target="_blank"><img src="http://ad.doubleclick.net/N4206/ad/rmm.usnews/prairieview_cc_wichitahutchinson_300x250vid;sz=300x250;ord=[timestamp]?"
    width="300" height="250" border="0" alt=""></a></noscript>
    <!-- end ad tag -->

This part ...

prairieview_cc_wichitahutchinson_300x250vid

... needs to be a DFP code in order for it to work right now.

To find the code, login to DFP and search for that code using the box in the upper-right corner.

Note that one ad unit show up for each publisher.

Underneath the heading that will look something like this:

"USNews.com (cpm) > prairieview_cc_wichitahutchinson_300x250vid" 

... you will see a "Code" and a "Name."

Normally, the code and name are supposed to be the same. Right now, however, 
you may find a code that's just a number, e.g.:

250137299

You will need to replace the zone (prairieview_cc_wichitahutchinson_300x250vid) with the code (250137299) in your tag 
so that they will now look like this:

<script language="JavaScript" src="http://ad.doubleclick.net/N4206/adj/rmm.usnews/250137299;sz=300x250;ord=[timestamp]?" type="text/javascript"></script>
    <noscript><a href="http://ad.doubleclick.net/N4206/jump/rmm.usnews/250137299;sz=300x250;ord=[timestamp]?"
    target="_blank"><img src="http://ad.doubleclick.net/N4206/ad/rmm.usnews/250137299;sz=300x250;ord=[timestamp]?"
    width="300" height="250" border="0" alt=""></a></noscript>
    <!-- end ad tag -->

Notice that the zone is in three places in each tag.
Also notice that the publisher (before the slash /) and the information after the semicolon should not be changed!

These new tags should preview.