Drag‘n‘Drop in Calendar does not work, range of weeks resets constantly

Hi there,

I have two issues with calendar view of the current version 5.7.2:

1) I am no longer able to move post in calendar view via drag‘n‘drop. When I try, I see a small spinning icon, which keeps spinning forever and the post is not moving at all.

2) The displayed range of weeks resets itself to 5 weeks whenever I switch the view.