Currently, Studio seems to enter an infinite hang when moving a large number of Keyframes at once. In this case, it was about 240 keyframes over 60 Elements.

See attached video.

Repro Steps:

1) Download and open the attached Studio Project.

2) In the Navigator, identify the UserControl named "TopographicPattern_UserControl" (found under the "Foreground_Group_Grid" Grid under the RootGrid.

3) Enter the TopographicPattern_UserControl's context menu, and open the UserControl's Template for Edit
This will then open in the dummy Template Editor.

4) Within the UserControl Template, navigate to the Animation/Storyboards Panel, and select the Storyboard named "TopoPattern_Animation".
This will open the Timeline, where you will see 60 Paths with their Opacity values keyed.

5) By clicking on an empty part of the Timeline, then pressing Ctrl+A, select all keyframes on the Timeline.

6) With all keyframes selected, click-and-drag on any of the first keyframes, and attempt to displace everything to the right so that the first keyframes begin at the 1s mark rather than at the 0s mark.

Observe all keyframes successfully moving, but the 'parent' keyframes remaining stuck at the 0s mark.
Observe Studio entering into an infinite hang period which can only be terminated by closing the unresponsive application.

Expected Results: I don't think this is an excessive amount of keyframes to displace at once, so I don't expect there to be major performance issues present with this sort of operation.