Hi,
I'm experiencing the same problem (desktop 10.1, server 10.1), 600dpi image is far from what I would expect, line symbols are clearly unproportionally exaggerated, If I shrink that 600dpi image to 96dpi, I get completely different look opposite to original 96dpi version ... also polygon fills (line fill used) are malformed (fill looks like zoomed, what is similar to these "too fat" lines mentioned above)
Radek Pohl