This conversation has been merged. Please reference the main conversation: Lightroom: LR5 - unwanted synchronisation of picture parameters
An internal error has occurred: history step does not belong to instance
I can resolve the issue if I catch it by going back through the history and forward again. This did not occur in LR4. I am using Win7 64. It occurs most when the load in my system is high. The catalog I use is quite large (>150k images) due to my workflow, and this may be a factor.
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