Blake,
Thanks for the testing!

* Glad to hear OCIOFileTransform is working. My goal is to support
(at a minimum) all of Nuke's lut formats in the near future.

* We're lucky that the nuke cineon transform happens to match Log2Lin.
The nuke-default OCIO profile is desogned to match all the lut
transforms used in the read-write nodes. (see
src/testbed/nuke_to_ocio.py for how we generated the nuke-default OCIO
profile). Nuke's log2lin node does an analytical transform based on
its configurable parameters, so it's only a fortunate circumstance
they match by default.

* OCIODisplay has it's default display transform set to 'None' by
default in the nuke-default profile. If you switch this to srgb you'll
see the node is working. (This is also why switching input colorspace
has no effect. If you select 'no processing', no matter what the
input is no work will be done).

* OCIOLogConvert doesn't work because the config.ocio file has a typo
in it. You can hand edit it to fix the issue. At the top of the
config is the compositing_log space, which is set to "cineon". But
down below the colorspace is listed as "Cineon". (Note the case
difference). If you fix the role's capitalization everything will
work.

What's happening is that the 'cineon' (lower case) role is not found,
so it's relying on the default role, "data". By design, any conversion
to or from a 'data' space is a no-op, so no processing occurs.

This 'silent error' is a critical mistake; I'll get in the appropriate
library fixes ASAP making sure this doesn't bite any other people.
I'll also update the Nuke profile today to fix the errors as well.

Thanks!

-- Jeremy