I have been doing some testing for this bug on Vilshanka and had this scenario happen:
If I select unit #1, then select #2 or #3 there will be no menu for #2 or #3. If I select any other unit, then select #2 or #3, they have menus.
Hope this helps some one figure out the issue.
And also may help some one the next time they get the bug, try selecting different units then back to the missing menu unit. However, it did not fix the menu bug. The unit was always bugged if I selected #1 first.
Think of it as another level of micro. So it a feature now
But twice now I have had the bug and could always get it if I selected the same units in the same order. Selected in a different order and the menus were correct.