Do Result_Ids Affect What Is Posted From A Template?

For some reason, the 'activate_files' data is no longer being POSTed when an order.details is saved. I log the POSTed data and the activate_files array is not being posted and hence download are not being activated.

Anyone else experiencing this issue? I may have caused it in trying to debug why notification of activation no longer occurs, but I've restored all the app/controllers/backend and design/backend/templates/views/orders files from the 4.4.2 distribution to be sure. I've cleared the cache but still no POST of the activate_files select values.