I am trying to export an image group as a multi-band GeoTiff using the r.out.gdal module in GRASS. For some reason I cannot get ArcGIS to recognize my GeoTiff exports. I have tried opening the file in Opticks and SAGA and neither of them can open it either. To simplify things, I generated a classification raster and tried to export this, with the same result that nothing recognizes it. I have tried playing with the module settings and adding createopt strings as recommended in the GRASS documentation for r.out.gdal, but nothing is working. Has anyone encountered this before?