I find that flipping jars is good just to let CO2 fall out. My money is that you either have a contam and don't know what to look for or your cakes are just plain cold. Green mold can be hard to spot sometimes, especially on birdseed. I suggest opening one jar dumping the sucker out so you can give it a whiff. What you want to smell is funky mushroom smell and not a putread or acrid scent. Also get yourself some cambodian spores, they are good for you (quick and easy strain). The more obvious problem that you have (without question) is that your cakes are cold. Remember that the names of the strains are names like cambodia, honduras, mexican, thailand and NOT maine, michigan, vermont. Your incubator can be as simple as a cooler with a bottle of warm water that you swap every one or two days. 85 to thrive! Oh one more thing if its too cold and your mycelium isn't colonizing quickly, you are allowing for mold, yeast, bacteria etc. to take over b/c they are much more flexible as far as temperature goes. 85 to thrive!