Tonelib GFX 4.9.0 changes my presets with Splitter

Greetings,

I've been trying to contact support about this for months, no reply. Hope this channel works.

When I installed 4.9.0, I've found a bug (!?) that made changes to my presets using Splitter: namely, the Pan values were turned all the way to 100% left and 100% right. And probably other changes because the whole thing just sounded different.

I've had to downgrade to 4.8.7 to get my sound back, as it were. Anyone else had this experience? Any hints? Am I doing something worng? (using M1 macbook with macos 14, by the way)

Thanks in advance.