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In Maya 2012, the mental ray and Maxwell tabs on the shape nodes of the camera and Area lights (amongst others) occupy different positions, so work together.

However on Maya 2013 they try and occupy the same position, thus one wipes the other out upon loading of the plug-in.

Mental ray has moved position, down to the space previously occupied by Maxwell, both can’t exist in the same space, one gets wiped.

I guess this issue is due to how mental ray (in Maya 2013) now being treated as a separate plug-in, the unfortunate side effect being, Maxwell gets pushed out or vice versa depending on which plug-in loads first.

I hope we can resolve this soon.

I can confirm this, was just about to post.

I hardly ever use Mental ray but needed too today. I had to uninstall the maxwell plugin to get them back. I couldn't turn off the plugin either for some reason.

I've reported this to Autodesk and they are looking into it.

This should be fixed in the update we've just released.

Confirmed fix. Thanks.