Xbuntu / AMD
Short description of error
When copy/pasting a pose (while having automatic keying toggled on) the pose will paste however if you scrub back and forth on the timeline you'll notice that the pose goes back to the original one.
Exact steps for others to reproduce the error
New file with basic armature
Turn on automatic keying
Key the armature on frame 1 in a "funky" pose
Go to frame 5
Key the armature in a "whacky" pose
Select all the bones and copy that pose
Go to frame 1
Paste the pose and you'll see it change into the "whacky" pose
Scrub on the timeline to frame 2 and then back to frame 1
You'll see the armature back in the original "funky" pose...