I purchased a 30"L x 30"W x 16" Thick Monarch Chopping Block recently from MMB (through a local restaurant equipment store). MMB had it in stock, so they shipped it to my local store, who then delivered it to me right away (ten days ago). When it was delivered, I noticed that some joints in the front appeared dark (almost black), but felt smooth -- I guess these might have been cracks but had been filled in. All the joints on the top and the sides looked tight, so I accepted the delivery, and have been oiling it once a day since then, with Emmet’s Elixir Butcher Block Oil. I haven't used it for cutting. http://www.butcherblock.com/shop/monarch-12-end-grain-chopping-block/ Now it started to show real joint cracks on the front and back. I think these joints are the same ones as those which had been filled previously. The longest joint crack is in the front; it goes from the bottom of the block all the way up to the top, and I can see the corresponding crack on the top, which was not there on the day of delivery. What could I do to prevent further cracks? The house has been really dry lately (16%-24% humidity), due to the cold weather and central heating. I have lowered the thermostat to 60F most of the time, and put a freestanding humidifier next to the block. The humidifier has been running non-stop for two days, but it's unable to increase the humidity by much. Should I fill the existing cracks immediately with wood filler or beeswax? The care instruction I received from MMB says to use wood filler, but the online resources suggest beeswax. If I use wood filler, what kind should I use? I assume it should be a food-grade filler? Also, some of the Emmet’s Elixir Butcher Block Oil that I applied probably has got into the cracks. Do I need to clean the oil out of cracks before applying the filler? I would highly appreciate any suggestions. Thank you very much! Edit to add: Attached is the care instruction I got from MMB.