Old trix threadIngredient list from google:
INGREDIENTS: corn (meal, flour), sugar, corn syrup, canola and/or rice bran oil, modified corn starch, corn starch, salt, guar gum, gum arabic, high fructose corn syrup, calcium carbonate, dicalcium phosphate, trisodium phosphate, red 40, yellow 6, blue 1 and other color added,
baking soda, sodium citrate, natural and artificial flavor, citric acid, malic acid, zinc and iron (mineral nutrients), vitamin C (sodium acorbate), a B vitamin (niacinamide), vitamin B6 (pyridoxine hydrochloride), vitamin B2 (riboflavin), vitamin B1 (thiamin mononitrate), vitamin A (palmitate), a B vitamin (folic acid), vitamin B12, vitamin D,
wheat starch. Freshness preserved by BHT.
The baking soda could be the problem.
The wheat starch tends to sneak in and out of the ingredient list, but I'll assume you have a box that doesn't list it (GM's says any wheat will be listed on the label). Makes my tummy feel safe when recipes change from production line to production line. I read somewhere else (sorry no link) that a small amount of wheat starch is added as a binder in trix. <shrug>