InterpolationWeightY strange behaviour

I was having no success with the parameter so I downloaded your example and it got me even more confused. The ‘effect’ is on when the parameter is off
I restarted Glyphs but still not working as expecting
Something I am getting wrong?

I just tried it and it seems to work fine for me. Toggling the checkbox updates the instance icon and the preview in the edit view.
What version of Glyphs do you have?

I’ve created a test file with just one glyph from my working file and it works fine.
So I am wondering if there are other parameters in my working file that are preventing InterpolationWeightY to work properly?
I am running 3.4.1 (3436) on OS 12.7.6

You need to send me the file so that I can tell you.

The code for “interpolationWeightYNumber” is VERY old. It seems that it is applied to the first axis, if it is weight or not. In Glyphs 2, the axes ordering was fixed …

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