Splunk JSChart truncation message not being displayed

According to the documentation, an error message should be displayed when exceeding the 1000 or 2000 object limit for charts rendered by JSChart. I have not seen this error message using Firefox (23.0.1) or IE (9.0.8112.16421 64 bit). Is this a browser issue?

When I look at the source HTML I do see code for a message, but it is not displayed, and that code is present even when there is no truncation:

<div class="JSChartContainer" style="width:100%; height:333px;"></div> <div class="inlineMessageContainer" style="display: none;">
    <p class="resultStatusMessage">
        <span class="inlineMessage">
            Search generated too much data for the current display configuration, results have been truncated.
            <span class="resultStatusHelp">
                <a href="/en-US/help?location=learnmore.charting.datatruncation" target="_blank" title="Splunk help" class="spl-external-link spl-icon-external-link-xsm">Learn More</a> 
            </span>
        </span>
    </p> </div>
    </div>