[Solved] Shell Execute problem

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I got a very strange behaviour with the execute command:

this works from console, switches my yamaha AVR to HDMI1:

pi@nanobox ~ $ ./avsend.py -c inp HDMI1
@MAIN:INP=HDMI1
@MAIN:ENHANCER=On
@MAIN:STRAIGHT=Off
@MAIN:SOUNDPRG=Surround Decoder
pi@nanobox ~ $

This doesn’t work, it says “done” but nothing happens:

But this works:

I really don’t get it. Can I see the return value of execute somewhere?

It’s solved, the button name is “HDMI1”, the id is “hdmi1”, it works when I choose hdmi1 instead of HDMI1 from the dropdown…