Wx-Mapdisplay 1 not starting on WinVista

[Helmut Kudrnovsky]

hi,

WinVista 32
Grass65-svn - self-compiled today in the osgeo4-win-tree
nc-dataset
region set to elevation

when starting grass with the wx-gui, the MapDisplay1 is not starting with following error:

Traceback (most recent call last):
  File "c:\OSGeo4W\apps\grass\grass-6.5.svn\etc\wxpython\gui
_modules\mapdisp_window.py", line 542, in OnIdle

self.UpdateMap(render=True)
  File "c:\OSGeo4W\apps\grass\grass-6.5.svn\etc\wxpython\gui
_modules\mapdisp_window.py", line 641, in UpdateMap

windres=windres)
  File "c:\OSGeo4W\apps\grass\grass-6.5.svn\etc\wxpython\gui
_modules\render.py", line 915, in Render

os.environ["GRASS_REGION"] = self.SetRegion(windres)
  File "c:\OSGeo4W\apps\grass\grass-6.5.svn\etc\wxpython\gui
_modules\render.py", line 717, in SetRegion

region = self.AdjustRegion()
  File "c:\OSGeo4W\apps\grass\grass-6.5.svn\etc\wxpython\gui
_modules\render.py", line 504, in AdjustRegion

self.region["nsres"] =  mapheight / self.height
ZeroDivisionError
:
float division

but I'm able to start another MapDisplay(s) successfully and to display raster- and vector-maps

best regards
helli
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