[Therion] Symbol different in legend to survey

Hi, I've notice that the area symbols look to be drawn at a different scale on my map than in the legend. I've attached two screenshots - look at the water (the lines are not the same distance apart) an the clay. This appears to happen only if I use base-scale, the attached images are with: scale 1 500 base-scale 1 200 but if I remove the base-scale line the symbols are the same in the legend and map. Am I using the base-scale option incorrectly, is there some way to tell it to apply that to the legend symbols as well as the map symbols? Or is it a bug? In case it makes a difference, I am using some custom symbols defined in my thconfig file (I found these from previous postings on this list, thank you!) Thanks, Jenny