There are two bugs I have seen:

Phenitia Park: Venom class
On the left side before the second turn: fall through track here.

Valparaiso: Phantom class
On the area before the two 90 degree turns: used a boost and game froze up and turned to a view with a lot of plants and vines; no track seen; frozen for 30 seconds, then back to the track, where I ran into the wall at first 90 degree turn

Anybody have these problems?