[All the problems with the tone curve toggle switch not getting copied by Copy/Paste Settings, Auto Sync, Sync, Snapshots, and SDK's photo:getDevelopSettings() were fixed in 7.4. Adobe has decided not to fix the problem with presets:
https://feedback.photoshop.com/photoshop_family/topics/pv2012_snapshots_not_saving_tonecurveenable_s...]
[See this post for a precise recipe for reproducing the bug: https://feedback.photoshop.com/photoshop_family/topics/pv2012_snapshots_not_saving_tonecurveenable_s...
Also, the SDK method photo:getDevelopSettings() fails to return the parameter "EnableToneCurve", which is surely a symptom of the same underlying bug. See:
https://feedback.photoshop.com/photoshop_family/topics/pv2012_snapshots_not_saving_tonecurveenable_s...
--John Ellis]
I created a snapshot, made some adjustments, then selected the snapshot, but it looked different than when I took it.Traced it to the ToneCurveEnable setting which was disabled when I took the snapshot, but enabled after selecting the snapshot further on down the road.Note: ToneCurveEnable setting is not in the develop settings when read by plugins/SDK either - I'm guessing there's a connection.This bug was logged a long time ago (against Lr3), but not fixed.Adobe: Please acknowledge this bug and fix in next release, OK?