I have severe problems with zippers. First, it doesnt not seem to have collision at all the garment just goes through. Second, more important, the zipper disappears when I try to modify the garment. I tried freezing, deactivating etc and the zipper just gets deleted. When I try to make new it does not let me.. I can follow the seam and all, but the zipper/tape does not appear at all.. whats wrong?