Hello all, We were using a Mega128 in one of our boards and we had to shift to Mega2561 as the requirement for program memory increased with advanced functional demands. We used Atman AVR demo and the code worked without a hitch. However when we use new (latest) WinAvr, the controller is resetting at one point or the other. We are using many sprintf_P functions to save RAM memory. Any clues, suggestions in helping us solve the problem will be highly appreciated. Thank you.