In this case, there were 397 tests run. We're using the cuanto API with a wrapper we created to write the tests to Cuanto. All tests ran and all passed (no fails, no skips, etc). I manually counted the number of tests displayed under the analysis tab and it's 397 just like the analysis page states on the bottom left corner, so all tests are accounted for. It's only when you're looking at the "Most recent runs" or "Test Runs History" view, that it's showing 396 tests run and passed. In the analysis view, if I hit "recalc" and then go back to the "most recent runs" view and refresh a few times, the count eventually comes up to 397 as expected.
Note, this is similar to the problem that still exists in this build where when you enter any analysis information, e.g. "Test Bug" under the "Reason" column, the analyzed results do not show up in the "most recent runs" or "Test Runs History" view. You have to hit "recalc" in the Analysis view first to get that analyzed data to update in those other views.
For this particular issue, I'm running Firefox 7.0.1.