Whenever I load a preset to change the characters appearance the actions in the animation will get misaligned. other than a built in reset button in the scene is their any way to fix this?
Usually missalignment happens if the model you replaced differs in scale/body proportion from the orginal model too much. More info about the scene and model you try to replace could help. Typlically a solution could be to offset the root node of the person a bit. But generally spoken animations are not able to "adapt" new proportions.