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As i could not test it with 2.42, I would like to ask the 2.42 user to verify a problem with inverting spec map textures and normal maps. Using normal maps and inverting on levels abpve 0.5 the mesh turns nearly black.
Using spec maps see pictures. This change on levels among 0.1 but you don`t have a spec effect than.
normalmaps are currently not invertible in Octane (the invert button just flips color, but you can't invert normalmpas like that). For the specular texture try to tweak power & gamma until it looks right.
THX for clarification, it was a error in reasoning by me. If I invert the spec in gimp I got the same results and a inverted normal map results in rubbish.