Unity 5.1.1 Transform Lag/Bug

Hi,

I ported my gave from 5.0.0f4 to 5.1.1f1. There appears to be a serious lag/bug on transforms. It appears both in the editor's player, and on the device (iOS device).

The bug. I am basically assigning a new Vector3 to a GameObject's (2D sprite) transform.position. In 5.0.0f4, the objects just 'reappear' in the assigned position. However, in 5.1.1f1, it seems as if the object is being animated between its current position and the newly assigned position and frames of it are visible in the scene.

Is anyone experiencing this problem? Is there a new catch, or is there something that must be done or set to avoid this?

Thanks!