I've found a minor but irritating bug in FTB 184.108.40.20634. If I edit the children details of a family, and tick the "known number of children" box and set it to zero, the box correctly says "Children: 0 (there are no children in this family)", but the "Place:" label then moves entirely OUTSIDE the marriage box, appearing to the right of it over the background, and any marriage place text isn't shown at all. This happens even if the FTB tree window is maximised and so the marriage box has expanded to full size, so it's not a "resizing" issue. It also works fine if I change the number of children to one or more.
Of course, I could just untick the "known" checkbox, but then the unnecessary "add son/daughter" box is always visible.