title: marker become invisible when line chart negative values in highcharts
body: <p>marker of negative value become invisible in line chart type in highcharts</p>
  
  <p>My fiddle is : <a href="http://jsfiddle.net/TnTsr/542/" rel="nofollow">http://jsfiddle.net/TnTsr/542/</a></p>
  
  <p>i have tried to change plot options but it seems like that there is no error in plot options.</p>
  
  <p>Advance thanks</p>
  
  <pre><code>{
      "chart": {
      "renderTo": "container",
      "reportCode": "container",
      "defaultSeriesType": "line",
      "events": {
  
      }
    },
    "title": {
      "text": null,
      "style": {
        "fontSize": "11px",
        "fontFamily": "Open Sans , sans-serif",
        "fontWeight": "normal"
      }
    },
    "subtitle": {
      "text": null,
      "style": {
        "fontSize": "11px",
        "fontFamily": "Open Sans , sans-serif",
        "fontWeight": "normal"
      }
    },
    "legend": {
      "floating": false,
      "enabled": false,
      "itemStyle": {
        "fontSize": "9px"
      },
      "verticalAlign": "bottom",
      "layout": "horizontal",
      "align": "center",
      "borderWidth": 0,
      "symbolWidth": 9
    },
    "xAxis": {
      "categories": [
        "Glendale Adventist ",
        "Simi Valley ",
        "Feather River ",
        "St Helena (Clearlake)",
        "White Memorial ",
        "Frank R Howard Memorial ",
        "San Joaquin Comm ",
        "St Helena ",
        "Sonora Reg ",
        "Ukiah Valley ",
        "Central Valley General"
      ],
      "categoriesFullName": [
        ""
      ],
      "enabledCategoryAbbreviation": false,
      "title": {
        "text": "",
        "style": {
          "fontSize": "12px",
          "fontFamily": "Open Sans , sans-serif",
          "color": "black",
          "fontWeight": "normal"
        }
      },
      "labels": {
        "enabled": true,
        "style": {
          "fontSize": "10px",
          "fontFamily": "Open Sans , sans-serif",
          "fontWeight": "normal"
        },
        "rotation": 315,
        "align": "right"
      }
    },
    "yAxis": [
      {
        "labels": {
          "style": {
            "fontSize": "12px",
            "fontFamily": "Open Sans , sans-serif",
            "fontWeight": "normal"
          }
        },
        "title": {
          "text": "CS-ALOS GAP",
          "tooltip": "At DRG Level CS-ALOS Gap = (Facility CS-ALOS) -(Benchmark CS-ALOS). At Any Level above DRG CS-ALOS Gap = (Gap Days)/Discharges",
          "style": {
            "fontSize": "12px",
            "fontFamily": "Open Sans , sans-serif",
            "color": "#3E576F",
            "fontWeight": "normal"
          }
        },
        "opposite": false,
        "plotLines": [
  
        ],
        "plotBands": [
  
        ]
      }
    ],
    "tooltip": {
      "shared": false,
      "borderWidth": "0",
      "backgroundColor": "rgba(255,255,255,1)",
      "style": {
        "line-height": "18px",
        "fontSize": "10px",
        "fontFamily": "Open Sans , sans-serif",
        "color": "#1A5488",
        "padding": "8px"
      },
      "Color": "#1A5488",
      "borderRadius": "3",
      "shadow": "false",
      "borderColor": "rgba(48,132,201,1)",
      "padding": "5",
      "font-family": "arial",
      "font-size": "10",
      "z-index": "10"
    },
    "credits": {
      "enabled": false
    },
    "plotOptions": {
      "column": {
        "dataLabels": {
  
        },
        "pointPadding": "0.01",
        "groupPadding": "0.09",
        "borderColor": "black",
        "borderWidth": 1,
        "shadow": false
      },
      "bar": {
        "dataLabels": {
  
        },
        "pointPadding": "0.01",
        "groupPadding": "0.09",
        "borderColor": "black",
        "borderWidth": 1,
        "shadow": false
      },
      "scatter": {
        "marker": {
          "radius": 9
        }
      },
      "pie": {
        "allowPointSelect": true,
        "cursor": "pointer",
        "dataLabels": {
          "enabled": true,
          "color": "#000000",
          "connectorColor": "#000000"
        }
      },
      "series": {
        "groupPadding": "0.04"
      }
    },
    "series": [
      {
        "name": "Hospitals",
        "type": "line",
        "yAxis": 0,
        "index": 0,
        "isAdditionalYAxisSeries": false,
        "color": "#0833ff",
        "data": [
          {
            "customTooltip": [
  
            ],
            "y": 1.12,
            "dataElementValue": "Glendale Adventist ",
            "dataElementName": "Hospitals",
            "columnStacking": false,
            "color": "#0833ff",
            "isPointColor": true,
            "isSeriesColor": true,
            "colorIndex": "0"
          },
          {
            "customTooltip": [
  
            ],
            "y": 0.99,
            "dataElementValue": "Simi Valley ",
            "dataElementName": "Hospitals",
            "columnStacking": false,
            "color": "#0833ff",
            "isPointColor": true,
            "isSeriesColor": true,
            "colorIndex": "0"
          },
          {
            "customTooltip": [
  
            ],
            "y": 0.71,
            "dataElementValue": "Feather River ",
            "dataElementName": "Hospitals",
            "columnStacking": false,
            "color": "#0833ff",
            "isPointColor": true,
            "isSeriesColor": true,
            "colorIndex": "0"
          },
          {
            "customTooltip": [
  
            ],
            "y": 0.7,
            "dataElementValue": "St Helena (Clearlake)",
            "dataElementName": "Hospitals",
            "columnStacking": false,
            "color": "#0833ff",
            "isPointColor": true,
            "isSeriesColor": true,
            "colorIndex": "0"
          },
          {
            "customTooltip": [
  
            ],
            "y": 0.68,
            "dataElementValue": "White Memorial ",
            "dataElementName": "Hospitals",
            "columnStacking": false,
            "color": "#0833ff",
            "isPointColor": true,
            "isSeriesColor": true,
            "colorIndex": "0"
          },
          {
            "customTooltip": [
  
            ],
            "y": 0.49,
            "dataElementValue": "Frank R Howard Memorial ",
            "dataElementName": "Hospitals",
            "columnStacking": false,
            "color": "#0833ff",
            "isPointColor": true,
            "isSeriesColor": true,
            "colorIndex": "0"
          },
          {
            "customTooltip": [
  
            ],
            "y": 0.37,
            "dataElementValue": "San Joaquin Comm ",
            "dataElementName": "Hospitals",
            "columnStacking": false,
            "color": "#0833ff",
            "isPointColor": true,
            "isSeriesColor": true,
            "colorIndex": "0"
          },
          {
            "customTooltip": [
  
            ],
            "y": 0.36,
            "dataElementValue": "St Helena ",
            "dataElementName": "Hospitals",
            "columnStacking": false,
            "color": "#0833ff",
            "isPointColor": true,
            "isSeriesColor": true,
            "colorIndex": "0"
          },
          {
            "customTooltip": [
  
            ],
            "y": -0.05,
            "dataElementValue": "Sonora Reg ",
            "dataElementName": "Hospitals",
            "columnStacking": false,
            "color": "#0833ff",
            "isPointColor": true,
            "isSeriesColor": true,
            "colorIndex": "0"
          },
          {
            "customTooltip": [
  
            ],
            "y": -0.23,
            "dataElementValue": "Ukiah Valley ",
            "dataElementName": "Hospitals",
            "columnStacking": false,
            "color": "#0833ff",
            "isPointColor": true,
            "isSeriesColor": true,
            "colorIndex": "0"
          },
          {
            "customTooltip": [
  
            ],
            "y": -0.3,
            "dataElementValue": "Central Valley General",
            "dataElementName": "Hospitals",
            "columnStacking": false,
            "color": "#0833ff",
            "isPointColor": true,
            "isSeriesColor": true,
            "colorIndex": "0"
          }
        ],
        "colorIndex": "0"
      }
    ],
    "exporting": {
      "enabled": false
    }
  }
  </code></pre>