With OpenColorIO activated, and a config loaded (here for example the nuke-default config), if I set View to sRGB or actually anything else than none produce this error log: "Error The specified transform file '/home/user/imageworks-OpenColorIO-Configs-9ce48d4/nuke-default/luts/srgb.spi1d' could not be loaded. Invalid 'From' Tag sending event 3 to object qt_scrollarea_viewport" and the canvas display doesn't change anymore trying to change other settings in LUT docker, returning other similar errors like: "Error The specified transform file '/home/user/imageworks-OpenColorIO-Configs-9ce48d4/nuke-default/luts/srgb.spi1d' could not be loaded. Invalid 'From' Tag sending event 2 to object slider" until I switch View back to None. It does the same with all different OCIO configs from the default imageworks package.
Hm, that seems to work here: use opengl true success "OPENGL_SUCCESS" QGLShader::link: "Fragment info ------------- 0(78) : warning C7533: global function texture3D is deprecated after version 120 " use opengl true success "OPENGL_SUCCESS" QGLShader::link: "Fragment info ------------- 0(78) : warning C7533: global function texture3D is deprecated after version 120 "
Yes, it must be caused by a/some newer system library, as I can reproduce on both Manjaro and Mageia which both have quite recent libs.
After investigation with dmitryK, we found it happens on my system because locale is set to french, which cause a bug in OCIO.. reported upstream: https://github.com/imageworks/OpenColorIO/issues/379
We can close then :-)