This happens in a25 and a26.   If I have a group of units selected and use Alt+double left-click, nothing happens. If I do it again, all other units get deselected (except for the one I've double-clicked on).   If I select a single unit, hold down shift, then use Alt+double left-click, then all units get selected.   If I have a group of units selected, and I use Alt+ right-click, I have to do that twice for a single unit to move from the group to gather, repair, mov