It seems that this results from blanks in the drill file. The standard CADSTAR (version 18 for me) drill file definition contains the line "SPACES 1" which results in drill files with blanks between the coordinates like that: T4 X-0887150 Y0459500 X-0830000 Y0427700 This seems to be misinterpreted by gerbv. A workaround would be to set the CADSTAR definition to "SPACES 0", however this may not be easy to do in a company with shared drill file definitions. I would prefer that gerbv can accept the...