It is important to note that incubating beardie eggs can be a long and arduous journey. Some unfortunate people lose an entire clutch late in the process of development. There are an imminent number of reasons: Perhaps the eggs were jostled too much, perhaps the temperature was too low and the beardies died because development was halted, perhaps the temperature was so high that the beardies died because respiration wasn't efficient enough to keep up with their needs. Their could be toxin in the substrate, mold could have affected the substrate and "killed" the eggs, their could be a defect in the developing embryo's, the owner could have provided too much moisture or not enough, the owner may have killed the eggs by directly spraying their surface with water, their could be fumes from some type of disinfectant or insecticide in the room, etc. Never spray eggs directly with water. The substrate should be damp but never wet. If one egg starts to mold separate it from the rest so it doesn't touch the others. Never turn the eggs. Do not handle them excessively. Do not use any type of chemicals or substances which produce fumes around the incubator. I hope you find this thread interesting. It comes directly from my own personal experiences with Popcorn and Tatty. Believe it or not, I had about 5 years of failure with another beardie before I ever had a success. When you have your first success and see those tiny eyes, you WILL be ecstatic.
Tatty