I have found that if one of the two angles of pad surface is 270 degrees, then the surface disappears from the geometry. Here is an example illustrating the problem:

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`% pads with 270 degrees`

cell 1 0 inpad -1 -10

cell 2 0 inpad -2 -10

% pads with almost 270

cell 3 0 inpad -3 -10

cell 4 0 inpad -4 -10

% pads with anohter angles

cell 5 0 inpad -5 -10

cell 6 0 inpad -6 -10

% other cells

cell 10 0 outpad 1 2 3 4 5 6 -10

cell 20 0 outside 10

% with 270

surf 1 pad 0 0 10 15 90 270

surf 2 pad 0 0 10 15 270 90

% almost 270

surf 3 pad 31 0 10 15 90 270.000001

surf 4 pad 31 0 10 15 269.999999 90

% other

surf 5 pad 0 31 10 15 0 180

surf 6 pad 0 31 10 15 180 0

surf 10 sph 0 0 0 100

plot 3 600 600 10 -20 50 -20 50

mat inpad -1

1001.03c 1

mat outpad -1

1001.03c 1

I have attached the PNG image generated. A test run of my original input shows that the pads really disappear.