I sometimes loose my history, for instance if I select a node in the history, and then move a slider without setting the history back to the latest node. Sometimes I still have a snapshot, but I cannot figure out how I can set the snapshot as working image and continue working from there?
The snapshot is a cached image, it does not save the history.
Every now and then, it may make sense to create a duplicate (it only copies the history, so takes ~10-20 kB).
But don’t worry, you’ll get used to going back to the top of the stack before you modify anything. 
A few years, and it’ll become second nature. 
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Cool thanks for the reply, good tip on the copy!
You can press ctrl-z after you loose history, it will revert it back.
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Yes that works sometimes, but not always… I find the undo quite unreliable on my system