I bought a pair of Asics Gel Challengers a couple months ago and have since developed a pain in my right instep. I can't say for sure that it's because of the sneakers, but it's the only footwear change I've made. Does this seem plausible? I've never had asics but went with them because I've had survery on both knees and need the cushioning. The feel great and fit well, but the pain is becoming more constant. Any advice or input would be appreciated. Thanks!