gmt grdimage -R0/360/-90/90 -Jq... silently fails to produce a plot. No errors reported.
example code:
gmt grdimage @earth_gebco_01d -R0/360/-90/90 -Jq0.05c -Q -png guick
the resulting quick.png contains only the auto-generated color bar:
gmt grdview -T plots the requested map:
gmt grdview -T @earth_gebco_01d -R0/360/-90/90 -Jq0.05c -png guick
the map looks as expected:

plotting using gmt grdimage also works if the poles are excluded from the region, e.g. -R0/360/-80/80.
gmt grdview is VERY slow for large grids for the apparent reasons.
gmt grdimage -R0/360/-90/90 -Jq...silently fails to produce a plot. No errors reported.example code:
the resulting
quick.pngcontains only the auto-generated color bar:gmt grdview -Tplots the requested map:the map looks as expected:

plotting using
gmt grdimagealso works if the poles are excluded from the region, e.g.-R0/360/-80/80.gmt grdviewis VERY slow for large grids for the apparent reasons.