The QGIS people ask for help with these open bugs:
Qgis 1.6/trunk, osgeo4w/standalone crashes when importing vectors
in a GRASS mapset or when adding them to the project
https://trac.osgeo.org/qgis/ticket/3648
-> v.in.ogr
shapefiles fails to be imported into GRASS mapset with qgis 1.6/trunk
under Windows (but import is fine under qgis 1.5)
https://trac.osgeo.org/qgis/ticket/3650
-> v.in.ogr
GRASS toolbox: error removing vectors from a mapset under Windows
https://trac.osgeo.org/qgis/ticket/3646
-> g.remove
Markus