The problem is now fixed. It was caused by setting the measurement input to Math while the Math calculation was turned off (oscilloscope/math/operator = off), now the application automatically adjusts the math operator to A+B+C mode when turned off.
The problem is now fixed. It was caused by setting the measurement input to Math while the Math calculation was turned off (oscilloscope/math/operator = off), now the application automatically adjusts the math operator to A+B+C mode when turned off.