Collision box is wrong: Check your code where you set it. If you can't find an obvious bug there, contact support with a test level so that they can look into it. Typical reasons of a wrong collision box are changing the entity scale or having entity frames with large size variations.
Mr. Lotter, what does the bold sentence mean in particular?
(A7.82) When I use
c_setminmax and the model has only one frame, the min/max dimensions are correct. If the model has some frames with different body sizes (or f.i. a hand that waves around) the min/max values get set to the maximal dimension of all frames together (it did not in 7.80).
This is not helpful.
EDIT:
c_updatehull does the same that means if you want the bounding box dimensions of a special frame that you will normally get by c_updatehull (in <= 7.80) it will not work at all (in 7.82).