Map Editor: Exporting while the magic finder is open causes a black screen

Map: Custom

I've repeated this.  What I do is create an action (ie. cast spell), then for the target I click "World", then while the magic finder is open in world view, hit escape and "export/test".  You'll get a message like "export successful" but the map won't load and you'll have a black screen.  You'll need to alt+f4 to get out of this bug.