DOF doesn't work when rendering a sequence

Using 3.6 and rendering a little camera move with some heavy DOF.
Rendering any frame as a one off works perfectly.
As soon as it comes to rendering the whole sequence, the DOF is on as it should be for the first frame, then it is disabled for all following frames.
This happens regardless of the frame it starts on.

Is this a known issue? any pointers as to how to fix/workaround?

Thanks

I could not reproduce that using a simple scene. Could you send us the scene to support@chaosgroup.com, so we can investigate. Please mention this thread.

Ok will do

edit: sent just now

Thank you for the scene.

I have managed to reproduce your issue. Animated F-number of V-Ray Physical camera / 3ds max physical camera is not working properly with V-Ray GPU.
As a workaround, you can enable the Depth of filed in the Render settings / Settings / Camera and set it accordingly. The issue is reported into our bug-tracker and will notify you, when there is any progress.

Martin, where can I find that option? I don’t see DOF there only moblur?

Hello Alex,

This option is only available in V-Ray Next. You can download a trial and try it out.