Switching between 'Follow Path' curves causes strange large motion blurs

Hi there,

I have a character following a series of curves by means of stacked ‘Follow Path’ constraints (one for each curve). When he comes to the end of 1st path, I animate the Follow Path influence of that 1st curve to zero and Follow Path influence of the next curve to 1 (thereby switching the curve folowing from 1st to 2nd seamlessly). The end of the first curve has the same World location as the beginning of the 2nd curve, so there is no gap for the character to jump from one path to next, and the character is moving at almost zero speed at the time of the transition.

And yet, when this transition happens, the character motion blurs to a huge extent as if he was travelling at 1000mph!

Can anybody explain this please? Thanks!