In the transition from 2.59 to 2.60, the FCurve actuator was removed. In 2.59 files, where FCurve actuators were used, 2.60 would replace them with Action actuators, which failed to properly play the original animation sequence.
The attached .blend (2.59) features a simple scene, with a Turret object that uses FCurve to play a recoil animation (press space to fire). Opening the file in 2.59, will show the appropriate behavior.
Opening the same file in 2.60, will show the inappropriate behavior, and therefore the problem itself.