Is there any particular reason that this HighStock chart:

var chart;

$(function() {
        chart = new Highcharts.StockChart({
            chart: {
                renderTo: 'container'
            },
            title: {

                text: 'Total balance over time'
            },
            xAxis: {
                type: 'datetime',
                maxZoom: 7 * 24 * 3600000, // one week
                title: {
                    text: null
               }
            },
            yAxis: {
                title: {
                    text: 'Balance'
                },

                startOnTick: false,
                showFirstLabel: false
            },
            tooltip: {
                shared: true
            },
            series: [{
                type: 'area',
                name: 'Account balance',
                pointInterval: 14 * 3600 * 1000,
                pointStart: Date.UTC(2012, 3, 11),
                data: [

                    0.7809, 0.7827, 0.7848, 0.785, 0.7873, 0.7894, 0.7907, 0.7909, 0.7947, 0.7987,

                    0.799, 0.7927, 0.79, 0.7878, 0.7878, 0.7907, 0.7922, 0.7937, 0.786, 0.787,

                    0.7838, 0.7838, 0.7837, 0.7836, 0.7806, 0.7825, 0.7798, 0.777, 0.777, 0.7772,

                    0.7793, 0.7788, 0.7785, 0.7832, 0.7865, 0.7865, 0.7853, 0.7847, 0.7809, 0.778,

                    0.7799, 0.78, 0.7801, 0.7765, 0.7785, 0.7811, 0.782, 0.7835, 0.7845, 0.7844,

                    0.782, 0.7811, 0.7795, 0.7794, 0.7806, 0.7794, 0.7794, 0.7778, 0.7793, 0.7808,

                    0.7824, 0.787, 0.7894, 0.7893, 0.7882, 0.7871, 0.7882, 0.7871, 0.7878, 0.79,

                    0.7901, 0.7898, 0.7879, 0.7886, 0.7858, 0.7814, 0.7825, 0.7826, 0.7826, 0.786,

                    0.7878, 0.7868, 0.7883, 0.7893, 0.7892, 0.7876, 0.785, 0.787, 0.7873, 0.7901,

                    0.7936, 0.7939, 0.7938, 0.7956, 0.7975, 0.7978, 0.7972, 0.7995, 0.7995

                ]
            }]
        });
    });

is rendered without any problems in Opera, but not working in Chrome or Firefox? I'm also using some HighChart pie charts. Those are rendered without any issues on all browsers. All of the demos on the HighStock Demo Gallery are working without problems.