In Elements I noticed the new SSL Duende Native E/G Channel, after Rendering, perform a fade-in at the beginning of the audio file. This happens if the Internal Dynamics section is activated. If deactivated, the Rendering process is ok.
SSL Duende Native E/G Channel is not part of WaveLab.
Thank you, I read many times users posting about various software houses and getting answers, I thought this might be a common issue.
I was wrong.
Anyway I contacted SSL to have an answer, might be useful for some WaveLab users.