Check you have not selected "Tuning - diapason" to remain unchanged (in "Freeze" panel).
In ver. 7, you can access "freeze" with ctrl+f
Not saying 'freeze' was the solution - but since I noticed this thread was started before ver. 7 came out - it's often a thing users can overlook - and is likely the main reason that ver. 7 implemented a system of copy/paste to eventually take over from freezing per se - but freezing may stay due to popular demand too.. so up in the air maybe for now - but - just interesting, that so many strange to solve issues are just related to people forgetting they froze some parameter a week ago etc.
Hoping you can get things to normal soon, dansatosan. I had assumed you got this working since no follow up post came.
tmyoung's thoughts are definitely on point, often the cause of something strange happening in any VST.
If these things don't help, definitely feel welcome to contact support - they're good and will look after you well.
I like that people post their issues here and delight in helping - but it's not necessary step before contacting support
Pianoteq Studio Bundle (Pro plus all instruments) - Kawai MP11 digital piano - Yamaha HS8 monitors