Why are viewports renders white?

[elisabetta123]

It is not a problem of EV value because if I do the active shade the image is fine, but when I send the render of the viewport the render is white. In the scene in addition to the object to be rendered there is only the sun which is set to obtain the right shadows.
Thanks

[TomG]

Since activeshade uses Arnold, the results from that can't be compared to what Corona will create - meaning it could indeed be the EV :) Try adjusting the exposure in the VFB.

[maru]

Can you send a scene where this is happening?

[elisabetta123]

This is what happens when I render the viewport, first green pixels of the object outline appear, then the image progressively becomes all white.
And it is not an Ev value problem because I tried to change it but the result is always the same.

[TomG]

Sending the scene as requested is the best next step :) See links in signature to find the private uploader.