OCIO generated incorrect shader code when using 1d luts.
It uses functions that are already deprecated.
NOTE: I don't receive any console error message, but the viewport output is fully black
Same result in master.
Perhaps we should wait until this is solved in an official OCIO release.
Looking at the code of OCIO it seems like they only support GLSL 4.0 core profile language or none core 1.3 atm.