When attempting to update any part of an issue, for example assigning the issue to another user the progress bar spins but does not stop. If I close the page and refresh the main page everything will be fine but there is not idea of when the user can safely close the window without disrupting something in the process.
Of note this morning I upgraded to 5.1 from 5.04
Attached is a screen shot of one of the dialogs windows that stays open. Note all dialogs windows tested stay open.