Cannot trash item

When I attempt to trash a particular paper which is a duplicate, the status indicator at the top of the page reports “Sent 1 paper to Trash”, however nothing happens, i.e. the paper remains in “All Papers” and the paper is not added to the Trash. I have tried various methods to Trash and none work (dragging to Trash folder, selecting item and clicking Down Triangle > Trash, etc).

I am on Mac OSX 10.11.6 using Chrome.