At the moment, the plugin expects that the last modified date of test results were updated at build time (created by the plugin or the touch command is applied for example).
The plugin tests that the test reports last modified date is inferior to 3 s.
What is your build time?
Moreover, you are able to check an option in the configuration to not activate this check.

The time at the top of the job is Apr 8, 2013 1:40:36 PM. This particular build took 59 seconds.

I found the checkbox, that's why I marked this trival for priority. I'm able to work around this by checking the box.

I did a mistake. 3 seconds is the delay between the start build time and the last modified date of the report file.
The objective is to not take reports from previous build if you don't have do a clean.

Is it still a issue for you?

If I disable the check,then I'm fine. I always do a clean, so this is fine for me. But you'll probably want to increase the timeout or make it configurable to make it useful. If a system is loaded it could be a few seconds between when cppcheck is run and the plugin is executed.

From 1.78, you have a suitable xUnit plugin which enable you to set the delay before failing build.