I'm not using DDUtil to control my amp however I was using DDUtil to set the barefoot power levels.
Prior to 1.0.24 DDUtil would set the barefoot drive levels to the values in the snapshot below. For example 80M was set to 61 watts for barefoot which I also use for driving my amp. After the beta was installed the values in DDUtil don't seem to have any effect. However the power levels are now persisted in SSDR.
So it's not an issue for me. The new persistence may be why you can't control the power from DDUtil. Just a guess.....someone from FRS could correct or confirm.