RV gerber only displays pads if they are gerber "flashes".
I just opened a paste layer generated by Eagle into GerbV.
When I highlight a regular pad it comes up as a "Flashed Aperture"
When I highlight a 45degree pad it comes up as a "Polygon".
Not sure if this is something that can be fixed in the Eagle CAM processor.
It certainly supports a number of Gerber variants so it might be worth
trying something other the 273x.
Alternatively, use my transfer file creator Eagle ULP. It's not perfect but
it hops over the need to send gerber and bom to RVgerber. I have done
a board with a 45 degree TQFP this way and is the reason I never noticed
this issue myself