Jonathan, In rectangle orbitdraw mode, using "maintain screen coordinates": The <F6> image coordinates get munged when changing anything at the <F2> screen coordinates prompt, provided the <F6> image coordinates had a non-zero rotation and/or skew angle. The <F6> coordinates "lose" their original angle/skew data, and magnification and x-magnification are grossly different than before. Below I've included the part of the source where (I think) the mistake has been made (unaltered save the four additional comments pointing to the offending lines). Regards, Gerald -------------------------------- 8< ------------------------------------ File: prompts2.c Line: 2347 In: get_screen_corners() svxxmin = xxmin; /* save these for later since cvtcorners modifies them */ svxxmax = xxmax; /* and we need to set them for cvtcentermag to work */ svxx3rd = xxmin; /* <-- xx3rd instead of xxmin ? */ svyymin = yymin; svyymax = yymax; svyy3rd = yymin; /* <-- yy3rd instead of yymin ? */ if (!set_orbit_corners && !keep_scrn_coords) { oxmin = xxmin; oxmax = xxmax; ox3rd = xxmin; /* <-- xx3rd instead of xxmin ? */ oymin = yymin; oymax = yymax; oy3rd = yymin; /* <-- yy3rd instead of yymin ? */ } -------------------------------- 8< ------------------------------------