[Closed] Eval() not called on preview creation? [Max2017 C++]

If you work with the 3dsmax sdk you probably know that Eval is trigger per object to force the update of your object.

I have an object that inherits from Helper and it works perfectly on the viewport and even on render (it controls other custom objects) but I’m surprised that it doesn’t works when you try to render a viewport preview video in 3dsmax 2017 (it works on previous versions without problem).

Any tip on this? it is driving me nuts.

Regards, Víctor