Attached is an example of PS code that is not rendered properly by the X11 interface of ghostscript 
(8.63 as well as 8.61).
The result should be a blue/red coloured triangle (using the image operator). However the bottom left 
corner is mostly missing. Change the line "100 0 moveto" to "0 0 moveto" and the whole triangle shows.
Shows properly however in ps2pdf for example.

%!PS-Adobe-3.0 EPSF-3.0
%%BoundingBox: (atend)
%%LanguageLevel: 2
%%Orientation: Portrait
%%EndComments

%%BeginPageSetup
% Init coordinate system and scales
% Scale is originally set to 0.24, which means that
% 1 inch on the paper equals 300 Postscript units
0.24 0.24 scale
%%EndPageSetup

300 300 translate

% Start of clip path
gsave
100 0 moveto
1800 0 lineto
1800 900 lineto
eoclip newpath
% End of clip path.  Clipping is currently ON

% Start of Ascii Adobe Indexed RGB image [1 bit]
1800 900 scale [/Indexed /DeviceRGB 1 <FF00000000FF>] setcolorspace
<< /ImageType 1 /Decode [0 1] /Width 36 /Height 18 /BitsPerComponent 1
   /ImageMatrix [36 0 0 -18 0 18] /DataSource currentfile /ASCII85Decode filter
>> image
+>mV<ng/M*[/T8^4rpsnpVp2981HD_mFNT'lSM3n0;?9!-
&7@!jk2mn5QOG".2eMT3U^8*'`cAg'@/^jYn@Rf@.*9#8!^D%3
[8TB4,AQ-)3A&)'i4~>
% End of Ascii Adobe Indexed RGB image
%
% Deactivate Map clip path
%
grestore
% Clipping is currently OFF
%%Trailer
%%BoundingBox: 72 72 504 288
showpage

end