Probably the moldy Italian herbs (maybe basil, oregano, majoram, thyme - all the herbs 'de provence)that you reacted too. I see someone just posted about hydrators here too, I'll add my question to that.
Yes these products can be sooo expensive. Buckweat cookies are about 2.20 GBP for a small pack here!! (about$5!), but I can make them easy and fresh for next to nothing.
Hopefully this principal will apply to the dehydrator. The idea of crunchy crackers and other foods (no matter what they are made of, as long as its safe!) gets me going!
I actually soaked some pumpkin, sunflower, sesame and linseed overnight, and come the am they had become very glue like (still tasty). I imagine that if they were dehdrated in this state then they would make excellent crispy, nutritous and even antifungal snacks. Even better with coconut oil and cinammon on, or maybe humous, or almond butter, or sprouts...I could go on!
OBJ - I have also learnt that airbourne ozone or dropping H202 in water (then soaking nuts/veggies etc)destroys all mold, making the foods REALLY safe. If I do this to my seeds (for crackers), maybe the H202 will remain present and prevent any mold from growing (not that I know if it will grow in the 1st place!).