Hello @Anonymous,
Is the camera target that is really small a max camera or a vray camera? I can help with the camera target, it would be great if you attached a scene for me to look at! Unfortunately I cannot help much with the Vray plane, as I can't officially do any technical support for Vray. I would suggest trying to post this question on the Vray forums and see if you can get a resolution to your problem. With any luck though the camera fix will also fix the vray plane.
I would say that somehow the units are acting up somewhere. There is a property called 'Non-Scaling Object Size' that maybe is a bit off for you. One of these links may help you with this. Please let me know if this works or doesn't work for you, and thank you.
Please hit the "Accept as Solution" button if my post fully solves your issue or answers your question. This lets me know that I was effective in helping you, and thank you for doing so.
Best Regards,