Problem With Zone Indicators

I'm having a problem with the Zone Indicator (Custom Campaign) unit—specifically, the zone indicator doesn't show up on the minimap. All that does is a grey square, like a building (the indicator is owned by Neutral Passive). I'm using ISeeDeadPeople to see it, if it matters... also, this map is part of a campaign built with the Campaign Editor.

Anyone know why this wouldn't be working?