I saw the following happen: Some townlabel2e5 disappear sooner than others when zooming out.
Steps to reproduce:
* Navit SVN, gtk gui
* map based on osm data, medium size, home grown, area from colmar to wuerzburg
* search for stuttgart and center it on the map
* zoom in
* now zoom out step by step, until the label stuttgart disappears
* Now move the map along the A8, until Pforzheim appears. It also is a town of type 2e5, but its label is visible
* Continue to move the map along the A8 until Karlsruhe appears. There is no label, though Karlsruhe is a town of type 2e5 as well
* Move the map up to the north, until Speyer appears. Its label is visible. It's also a town of type 2e5.
No clue, but maybe this issue is related to #232.