I am trying to use GRASS within QGIS - I have created a mapset etc in accordance with these instructions from other posts, and I am trying to create a raster map from shapefile contour information to create a DEM (and eventually run a ZTV through r.viewshed!)
I have imported my shapefile contours into GRASS as vector using v.in.ogv.qgis and converted to raster using v.to.rast.attr.
However, as I clicked 'Show Output' to add the successfully created raster to my map (to then run r.surf.contour), my QGIS crashed, and when I open it again (and re-open QGIS mapset etc) I can't load the raster I have created.
When I navigate to the source folder, I can see that there has been a raster created, but when I drag into QGIS I get an error on compatible format.
I've also tried r.external and r.in.gdal to no avail - not recognized as a supported file format.
Is there any way I can use this raster?
It took a while to process so I'd rather not run again if I can help it!
I am a QGIS newbie.
I am using QGIS 2.10.1 PISA with OS Sierra.
EDIT: Now upgraded to QGIS 2.18 LAS PALMAS as suggested in comments, but problem still occurs.