Originally Posted by
njohn858
I'm experiencing this too, but the workaround I've found is to add all the combat text into the main text box of the power (eg Attack: Charisma + Level vs. PD Hit: 1d6 + Charisma Fire damage.), then after adding the non-functional Power Attack, going through the radial menu and clicking "Reset Power Actions." This seems to re-parse the text from the power and automatically add the correctly-calculated Power Attack.
But I can confirm that after expanding the power attack to update the attack details, clicking on the button to add the level does not work. This is true for both the powers from the corebook as well as user-created powers. You can even see the blank field in Targas' screenshot.