Reply by tenontim

That’s a very nice and well designed table. The joinery is most likely not your problem. As already mentioned, if the board was improperly dried, it could have “case hardened”, which will cause this problem. Not sure how this table would look with bread board ends. Maybe some on the thin side would look alright. I believe if you fill the cracks, it will continue to crack with climate changes.

-- Tim-- http://www.tmuli.com