missing names of larger streets

On my Moto x (1st gen, Android 4.4.4) using actual locus pro and the actual vec v3 / mapsforge-map-writer-0.3.0 Map Jan 28 2015 for Germany/Hessen (from locus store) I wanted to go through Darmstadt (starting Hauptbahnhof / Main Station) by bike.

Focusing on using the larger streets I realized there where lot of details but NO names for the larger streets at all.

Using the online OSM World Classic I get all this Information.

Same problem occured using the previous Mapforge Map of 2014.

Any settings to correct? Changing the textsize didn't do the job.