I recently (a couple days ago) switched my boy over to a complete pheonix worm diet. Crickets were causing minor impactions and the worms are overall more healthy. Anyway,his poop has been unusually smelly forabout two day. It is formed and he is eating 50+ medium worms per feeding twice a day.
Try probiotics like Pet Authority Acidophilus+, Bene-Bac+, or non dairy acidophilus pills from drug store (rite-aid etc) or a fecal test if it gets worse. Good luck!