No there has not.
Ison is still on the orbit predicted.
There has been no magic change.
And there is no way for its orbit outward to intersect with ours.
It is above the plane of the ecliptic.
Ecliptic being our orbit.
On the swing around the sun, ison followed what was predicted.
The only surprise was the activity of the nucleus ceased.
Look up comet 96p/machholz.
For what bpearthwatch says to be true, comet macholz cannot exist.
Nor should encke or temple Tuttle.