Printing graphics in MM_TWIPS mapping mode problem

[Denny101]

Hi,
I have a problem printing graphics in MM_TWIPS mapping mode - all graphics (lines, arcs) are weak and increasing Pen width or changing pen mode does not have any effect. However, text is printed OK in MM_TWIPS.
If I change the mapping mode to MM_LOMETRIC (example) the graphics are printed OK. So it MM_TWIPS that is giving me the problem with graphics.
I use Borland Buider 6 but maybe this is not the issue - not sure.
Thank you for your help,
Denny101