When using the arrow keys to move a group of objects, it will only respond for a few key presses and then the selected object won't move anymore. When clicking and dragging the selection, the objects disappear and all I can see is a red square which is useless as I can't see where I need to place the group. This bug is intermittent. The attached image shows what happens when I click and drag. 
Brand new interactions and interfaces. 
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