[Libosmscout-development] Mac Question

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Hi,

im trying to use libosmscout on MacOSX (10.10.5). I successfully  
compiled most of the libs and OSMScout2. Starting and displaying a map  
on OSMScout2 works but as soon as i start to zoom with the mousewheel  
(apple magic mouse) the map goes blank. Zooming through the MapButtons  
works as well as using keyboard "+" or "-". Panning with mouse also  
works.

When zooming with wheel the output changes from
Draw: [51.93906 N 12.16316 E - 54.39365 N 14.62068 E] 256x/8 480x800  
103.00000 DPI
Paths: 68/68/68/0 (pcs) 0.000/0.000/0.000/0.000 (sec)
Areas: 0/0/0 (pcs) 0.000/0.000/0.000 (sec)
Nodes: 6+0/6 (pcs) 0.002/0.000 (sec)
Labels: 2/0/2 (pcs) 0.001 (sec)

To:
Draw: [90.00000 S inf W - 90.00000 N inf E] 0x/0 480x800 103.00000 DPI
Paths: 0/0/0/0 (pcs) 0.000/0.000/0.000/0.000 (sec)
Areas: 0/0/0 (pcs) 0.000/0.000/0.000 (sec)
Nodes: 0+0/0 (pcs) 0.000/0.000 (sec)
Labels: 0/0/0 (pcs) 0.000 (sec)

Is there something i can/should check or something i can do to debug this?

Regards,
Adrian