Sometimes when the connector##terminals are 0,0 they may work but can get lost when importing into a graphics editor. The connector##terminals can be any size and don't even have to be rectangles, they can be lines... Rectangles seam to be the norm and they are easier to locate in a graphics editor... Your wire will always connect to the center of the rectangle/line... I center the rectangle on the end of the connector##pin and make them no wider then the connector##pin, about 0.01" max. Sometimes I make them 0.001" or 0.005"... depends what I feel like that day... does not make any difference as they have no color... The reason I make them bigger, like 0.01" or 0.005" is that I add a fill color (like red) so that I can keep track of them and know where they are at until I get them in place, then remove the fill.
If they don't work, then you probably have something else going on like not properly labeled or misspelled, Check the ID labels between your .fzp and .svg to make sure they correspond.