Ver 3.3.93847, not RotW
First time editing a character. Minor changes to an existing character, saves okay as 2.5+, and loads. Changes to character are present and work but I can no longer affect a Merc. "O" does nothing. Shift-X to give a potion does nothing. Manually drag a potion to the Merc in the upper left and it falls to the ground. Hire a new one and cannot open or affect it. Travel by Waypoint in the same level (I, II, III, or IV) and merc travels with. Change levels and merc is gone.
As expected, saving edits in RotW format gives an error during game load.