@balloni55: seems you are a) only one who have problem or b) only one who try to use it

If it do not work clearly on first attempt, I'll have to improve it somehow. Anyway you should simply for example enable your calibrated map (with on-board calibrator) or for test, downloaded Australian KMZ from Store - enable in Data > Items as you probably did. Then green icon appear on map screen - open it > tap on item in list (there should list of enabled kml/kmz files) and click on them
@tramp20: oki, anyway just icon has changed

@ta-ka: sure, I thanks for report
@gynta: hmm, it won't be nice. Is it really problem?