Flex :: Unable To Select Item In Spark.components.List After De-selection

I have a spark List defined as:

<s:List id="symbolList" dataProvider="{symbolListCollection}" change="symbolNameChangeHandler(event)"></s:List>

With the change handler defined like this:

protected function symbolNameChangeHandler(event:IndexChangeEvent):void {
symbolList.validateProperties();
changeSymbolView(symbolList.selectedItem);
}

and symbolListCollection as an ArrayList filled with Strings.

At first, the change event works fine, and I get what I expect.

However, if I Ctrl-click on the selected item, to de-select it, i am unable to ever select an item again.

When I click on something to try to select it, the change event DOES fire, however, the ItemChangeEvent has both oldIndex and newIndex set to -1