[mkgmap-dev] transparent overlays breaks address-index on GPS

Hi, Is there anyone else who has tried to use a transparent overlay on an mkgmap builded map which is containing address-index, eg. openmtbmap.org maps?. Everytime i tried it, the index no more works on the gps. Instead using the same overlay with an original garmin map which contains a address-index, this index stays alive on the GPS.? Any ideas? cheers Gert