titijo Since you own a Stage, are you aware, that the Stage offers two effect loops? The easiest explanation for your scenario is that you connected your gear to the upper loop and configured the lower loop in your Rigs or vice verse. As soon as you activate the loop, the signal chain is broken.
thks for your message . Yes i use my kemper on tour since 2 year with different artist and i know out to set it up well . After a lot of message with the kemper technical service , they told me that my kemper need to be repair and i'm going to send it to kemper service . 1 month before the end of the warranty...ouf