component color properties cause problems in property inspector

I have a small QML project containing a main qml file and several QML implemented components. When selecting a component in the main QML view, I get the component's properties in the right hand side property inspector. This fails however, as soon as the selected component contains a 'color' property.

This component's properties are both shown:

Item {
property real someVal
property string someOtherVal
}

With this component, however, no properties are shown:

Item {
property real someVal
property string someOtherVal
property color someThirdVal
}

The color property seems to cause some problems here, since it not only refuses to show, but also prevents the other two from being shown