This has been an ongoing issue for sometime. Have been working with older versions of Redcine-X, ver. 50.1 because those were the only versions that would work, sometimes, with my system. iMac 5k. 32 GB ram. Looks presets stopped working so I upgraded to ver. 51.47074 the smorning and the image curves no longer work, look presets still not working for me. Going back to an older version.

Will try Rand Thompson's suggestions first.

Thank you.