This forum is for scupdates and you should post any NetChk product questions in the Shavlik General forum.
Apple silently released 18.104.22.168 one day after they released 22.214.171.124. After digging on their support forums, they introduced a bug that broke Apple Sync. 126.96.36.199 fixed this issue. You probably haven't heard about 188.8.131.52 because they did not announce this product.