If you have multiple toolpath groups, and they are collapsed, CC will expand them all at the drop of a hat.
Create a new toolpath group? ALL groups expanded. Rename a toolpath group? ALL groups expanded. Add a toolpath? ALL groups expanded.
The only thing that should be expanded is the toolgroup you are adding a toolpath too.
I noticed this happening just yesterday for the first time, I thought I was forgetting to collapse my groups! As you know, it makes it a lot easier to focus on the particular group that you are currently working on and I hope this gets remedied soon 
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