Balance won't work

Hello,

I don't know what to do. My balance isn't working anymore. It doesn't matter if it's a mono or stereo audio file: If I turn the knob to R100, the clip just gets quieter instead of just playing on the right. On the left it's just normal volume. I tried it with a stereo track, with a mono track, with mono to stereo conversion, different headphones, all the same. What have I adjusted or am I doing wrong?

Thanks,

Piero

(working with the latest version on Windows)