With Version 1.13 of the Radiator View Plugin Builds with Test Failures are not shown as yellow anylonger but are red. This is true for all WebKit browsers and Firefox browsers because of this CSS entry:

.failing {
  background-image: -webkit-gradient(...red...);
  background-image: -moz-linear-gradient(...red...);
}

and the HTML source for reading:

<div style="background-color:red;" class="job failing normal">Failed Build</div>
<div style="background-color:yellow;" class="job failing normal">Failed Tests</div>

Thus the gradient overrides the background-color and both jobs are shown as being red.