This is the command I'm using that renders fine:

shp2img \
-m /maps/config.map \
-o /sources/testb.png \
-e -118.41347694396971 33.919930516263086 -118.40274810791016
33.92787160756615 \
-s 500 500 \
-l mylayer \
-all_debug 5 \

And this WMS request renders a transparent image:

http://localhost:8080/?map=/maps/config.map&SERVICE=WMS&VERSION=1.1.1%20&REQUEST=GetMap&LAYERS=mylayer&STYLES=&SRS=EPSG:4326&BBOX=-118.41347694396971,33.919930516263086,-118.40274810791016,33.92787160756615&WIDTH=500&HEIGHT=500&FORMAT=image/png

This is my mapfile:

# A valid mapfile used for testing
MAP
  NAME valid
  STATUS ON
  PROJECTION
    "init=epsg:4326"
  END

  # IMAGECOLOR 0 0 0
  TRANSPARENT ON

  WEB
    METADATA
      "wms_title"           "Slingshot WMS Server"
      "wms_onlineresource"  "http://localhost:8080/?map=config.map&";
      "wms_enable_request"  "GetCapabilities GetMap GetFeatureInfo"
      "wms_srs"             "EPSG:4326 EPSG:3857"
  END
  END

  LAYER
    NAME "myindex"
    STATUS ON
    TYPE POLYGON
    CONNECTIONTYPE POSTGIS
    CONNECTION "mypostgisconnection"
    DATA "geometry from (select i.geometry, i.id, '/sources/' || i.path as
location from images_image) as myindex using unique id"
    CLASS
      STYLE
        OUTLINECOLOR 0 0 0
        COLOR 0 255 0
        WIDTH 1.0
        ANTIALIAS true
      END
    END
  END

  LAYER
    NAME "mylayer"
    STATUS ON
    TILEINDEX "myindex"
    TILEITEM "location"
    PROCESSING "SCALE=AUTO"
    TYPE RASTER
    PROJECTION
      AUTO
    END
    METADATA
      "wms_title"           "My Imagery"
    END
  END

END

I'm using MapServer 7.0.1

Thanks!
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