I'm solving a quadratic program at multiple different points. I've run the program on 3 different machines, a Mac Mini running OS X 10.9 (Mavericks), a desktop running Windows 8.1 and a laptop running Windows 8.1. All machines are running MATLAB 2014a. The Mac mini and the desktop PC solve the quadratic program using quadprog quickly with no issues. The laptop however returns that the max number of iterations have been exceeded at multiple points and returns a much different, worse solution. The program is exactly the same and quadprog is called with the same options (active-set, tolerances, max iterations etc) on all machines. Literally nothing in the program is being changed between runs on different computers. Does anyone have any idea what could be causing this behavior?