Render issue, Vray always renders the half frame +.50

[Robert]

I have an issue with one Modo scene. If I open the scene or if I just import it to another scene, V-Ray will always render the in-between frame. So Frame 10 will be 10.5. Frame 40 will be 40.5. This of course spoils all animation.
Now I had that thing in the past, and it was related to motion blur. But this time it's sticky. It doesn't go away without motion blur. I can even do a simpler test. Import that scene into another, then delete everything. Stil V-Ray renders the in-between frame. Thats a nightmare!

[Robert]

Damn, after 2 hours of desperate search I found it !!!
There was a render element not delete for motion blur. It was not in shader tree and was not visible in render element dialog. But, there was (1) beside select.. so I hit the delete button in render dialog and then it worked.
How mean is that! So hidden, so invisible so... arghhh...