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1. When there are only three and I want to add the fourth, where do I specify this? Adding a field or 'other' adds a movable item but not a fourth item to the bottom row.
When you edit a layout, you will see the bottom toolbar field placeholders, either with names if a field has been selected, or with "Empty" if not. You can tap one of these, then select the desired field from the menu that appears. To remove a field, scroll to the bottom of the menu and select Remove.
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2. Usually the last item is 'Title+1'. It does not fix itself to the righthand side as it automatically did in past versions.
I haven't seen any problems with this. Please submit a help ticket and specify the name of the layout where you see this:
http://helpdesk.arlomedia.com/arlomedia/add.html