I'm having a few issues when I switch from tiff8 to tiff16 in the render settings.
When the settings are set to 8bit maya's preview render show this:

(this is a screen grab of maya's render view)
When I flip to tiff16, the render preview flips to this:

(this is a screen grab of maya's render view)
Also, there's an issue when you render both the 8 and 16 bit (.exr). Both are dark.
I've added a 2.2 gamma in photoshop which brings the images back a bit, but is this the best way to work?
cheers,
Steve