There is something in Develop called Auto Sync, but it has nothing to do with syncing to a mobile device. So you need to find out more.
Look at the first file in April, then go to Develop's History panel. What does its last step say? Now go to the next, what's its last step? etc If all these are identical, it's possible you reset the photos while Auto Sync was enabled. Do you think you actually did this? Or something else?
Hi, thanks for the rely. And yes, they all say "Synchronize settings" at the top of the history panel. I honestly don't know when or how I set it this way, it was likely something accidental. It had been resetting the edits each time I opened it, but I have stopped the syncing somehow it seems, now I just have to find the last proper edit in the history. I'm assuming there is no quick fix to restore my previous edits, I'll just have to go one by one, right? And just so I understand (and don't repeat this) what is the process for doing this, how would I have enabled the sync?
OK, then that does mean you switched on AutoSync, did the reset, and then maybe switched it off. Or you could have done a normal Sync Settings but not noticed you had all the images selected. I'd bet the second is more likely.
Assuming you can't simply Undo, yes, you will have to go through each image. What about yesterday's catalogue backup? Could you restore that? Is there a backup before the mistake?
As to how it happened and how to stop it again. Well, that's a matter of being careful and watching what is shown in the filmstrip. AutoSync mode is great for working quickly, but you should not switch it on and off - work with it enabled all the time (which is what I do) or only enable and disable it with caution. If it was regular Sync Settings, then ensure you always see how many photos are selected.
Thanks for the help! I don't know anything about this feature including how to turn it on or off (I'm blaming small children's fingers playing on my computer for this one), but I can check it out.
Imagine you have ten pictures of the same subject, same lighting, so they might need the same adjustments - even the dust spots are in the same place. Auto Sync is enabled by the switch at the bottom of the right hand panel in Develop and it means that every adjustment applies automatically to all the selected photos. So with one drag of the slider, all ten get adjusted.
It's the most efficient way to work, meaning no need to copy adjustments from one to the other, but you do have to keep your head screwed on.
That button is huge, how have I never noticed it! Thanks again for your help