That's not possible because also with new map data it's still broken and if I use halve of the tiles it's okay and also other halve is okay -- there must be some structrural problem - though maybe some tile together with a second is responsible - can you provide a link to the topic?
Felix,
Someone on the Dutch forum.gps.nl reported that this is caused by a corrupt tile
(either Corsica or the Bay of Biscay) in your Velomap/Openmtbmap.
When he left it out there were no problems anymore on his Etrex 30.