I hope you don't mind I'm cross-posting a link to this related issue that was closed because it couldn't be reproduce, except I have now added a comment about reproducing it and have attached a video:
I wasn't sure if the comment / video would be seen for an issue that's marked as resolved, so cross-posting to a related, active issue :)
(It sounds the same as the issue jasonjbrown quoted about clicking vs using the arrow keys)
Please capture a screen video about this issue and provide your project file to help us identify the problem.
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I'm not stupid! Selecting from the tree window DOES NOT WORK.
1. Select "Edit> Object Transform"
2. Select "Edit> Layer Keys"
Now I can select from the tree list.
Feedback Tracker Admin
You have to select the part what you want on the tree list screen,
after that you will see the keys of part in Curve Editor window.
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