Xbuntu / AMD
Short description of error
When working with an armature, in the action editor the "Only include channels relating to selected objects and data." button (the one with the arrow icon next to the Summary button) doesn't activate right away, you have to select or deselect something to get it to update.
Exact steps for others to reproduce the error
Make armature with multiple bones and only select one bone
Go to the Action Editor
Click the "Only include channels relating to selected objects and data." button
...witness nothing happening...
Select another bone
...witness everything suddenly working...