I found a fix for users of V-Ray for Maya who are having problems with V-Ray’s VFB disappearing when you try to bring it up. I have no idea what causes this but it's an easy fix! Open your Maya ASCII file in a text editor I use Textpad and delete the VFB parameters.
Just search for the file for “VFB” and delete that set of data. Save as a copy and reopen in Maya and the VFB will work again.
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