Yudishtira
Spiritual/Creative
You can select a unit that is part of a group, without removing it from the group. That's when these oddities (of orders buttons not available) occur.I'm thinking the issue I have with SM Split / Merge sometimes not showing up maybe doesn't have anything to do with SM after all. I created a stack of like 5 Gatherer's at the same time. The first one I select had the 3 automate buttons but if I selected the 2nd - 5th ones all 3 automate buttons were missing. When I sent out the first one then I got the automate buttons for the 2nd one but not the others and so on. Might have something to do with the unit list mechanics.
The SM thing happens with all units I've tried to merge / split randomly but I've mostly figured out a workaround. Splitting one and then merging it back will usually give me the option to merge them again.
When you select a group, you have an orders button with iirc 3 arrows diverging, to 'disband' the group into individual units.
When you select a single unit while it is still in a group, there is a 'reciprocal' orders button with the arrows converging. I don't know what it does, except that clicking it makes it go away, and you have to do this before including the unit in a merge (and probably also before splitting it). Mysteriously missing automation buttons follow the same pattern.