The "Copy Week" button will now only appear anytime the week currently being viewed has planned sessions.

The dropdown list of target weeks for copying has been enhanced:

If viewing the current actual week or any future week, the dropdown will list the 8 weeks immediately following the viewed week.

If viewing a past week, the dropdown will list all weeks from the week after the viewed week, up to 8 weeks from the actual current date.

Long story short, it should now work as expected :)