There is a limit of maximum 2.2A that can be output to the circuit that drive the MAC valve for boost control.
When that limit is reached, the power is interrupted and a fault is set into the ECU. MAC valves are usually rated at 5.4W unit, 0.45A (It was initially miscalculated at 2.22A, see comments)

• The overcurrent limit should be investigated as it can prevent boost control from working

When re-opening an altered map on the editor, the changes are lost

Culprit has been identified, a fix is under testing and should be uploaded tomorrow

Enter > value > enter
Arrow to move to other value and it goes back to previous

Enter > value > arrow and it stays changed

Constants changes are not saved after modifications

This is not a real task. You should close it and start opening some real tasks.