When plotOptions.pie.useHTML is set to true, the label text (but not the connector nor the pie slices) are showing through the mostly opaque tooltip background when using Chrome 18 or Firefox 10. It is not a problem in IE8.
See http://jsfiddle.net/mcs101/cV7Bk/6225/ and hover over item #nine or #ten.
How can I get around this issue?
Note: I need to set useHTML to true since the labels have to include icon images.