UPDATE: Issue was found to be bug in Trial version that I was using
UPDATE: Reported as fixed!
"To offset, first and last keys must be the same"
I have a leg with 3 bones. I've created a Dopesheet with 3 keyfames, a starting position, one where the leg bones have been rotated slightly and an end keyframe that is a copy of the starting position.
I enable "Adjust" and "Offset", drag select the 3 keyframes of the middle bone and attempt to move them along the timeline; that's when I get the message.
In an attempt to eliminate all other possibilities, I created a new document containing nothing but the linked bones, and tried to perform the offset, same issue.
Please look at the screenshot, I's probably something simple but I've been hours trying to find the solution for this...
(I have the money set aside to buy the program, but wanted to explore it fully before committing to it. Hence the trial).