QGIS » QGIS Application

At least on Windows, when there is a forward transform exception (like the message below), the mouse cursor changes to an hourglass and it becomes impossible to do things like right-click on anything, or close QGIS (you need to kill the process).

forward transform of
(0.000000, 1.570796)
PROJ.4: +proj=tmerc +lat_0=0 +lon_0=173 +k=0.9996 +x_0=1600000 +y_0=10000000 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +to +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext  +no_defs
Error: tolerance condition error