I've found two issues with the Animations creation screen.
#1.) The "menu" sporadically pops up, seemingly on its own, whenever I'm dragging graphics with the left mouse button. It doesn't do it every time, or every 3rd time, etc, it just seems to be at random. As seen here
#2.) When creating each individual frame for the actual animation, the "Paste Last" seems to be broken - unless I am doing something wrong? I'll try my best to explain w/ the following screen shots:
Step 1 - starting on frame 18 - added "slash" graphic
Step 2: proceed to frame 19, add "Splatter" graphics
Step 3 - Proceed to frame #20 and click "paste last" to bring over graphics from frame 19
Step 4: move the "splatter graphics" to a new location on frame 20 to give the perception of movement (from 19 to frame 20, position change, looks like it moved)
Step 5: The bug reveals its ugly head. After moving the images on frame 20, click back to frame 19 to see that the ones on frame 19 moved themselves as well.
For now - for animations, I just keep recreating the graphics and bouncing back & forth between frames to make sure I have them lined up --- but the "paste last" button saves soooooo much time for these long animations, I'd love to see it working.