I've never had this happen breaking in new walking shoes. Fifteen years of walking and replacing shoes and I'm stumped. Old shoes on the left, new shoes on the right; I keep the old ones in case the new ones don't work out. I've had that happen and out they go or to the garden or painting shoe. Never had a pair like these: first day walking: perfect. Next day: a blister on top of my 3rd toe. Went back to my old shoes for a couple days. Blister healed. Next time with the new shoes: blister on my heel. Almost ready to ditch them, but something tells me they will work. A couple more days with the old ones, blister bandaid in place. New shoes are perfect again. Stay tuned. . . anyone have a similar experience?