please, check the TagVisibility parameter of Goto flag - if it is set to "local" it is not visible to the MB driver. Also check the output of REXYGEN Compiler which will tell you details about wrong setup of flags.
the compilation error is correct. Your settings have for the same input values (3 times "0") 3 different outputs (0, 300, 500) - which doesn't make sense. What would you expect to have on output when input signal is equal to zero? The "up" sequence (X-axis) should be growing.
Hi Arnaud, was this problem caused by downloading to a local computer instead of a Raspberry too? Btw. when you installed Rexygen studio, did you check the Python function blocks option?