Ok, so I made a clean reinstall of the plugin with the 1.1.0.522 version (which I already had)
In standalone mode, I changed the buffer size to 128 samples (2.9ms, preset from Matrix) instead of 89 samples (2ms, preset from my soundcard).
All works fine now.
But with my daw, it's always impossible to use Matrix in VST2 or VST3...
The only way to use it is to open it in the Analog Lab VST.
In my daw, I can't choose the 128 samples buffer size, I have only choice between 2ms, 3ms, 4ms, etc... from my soundcard
Even with a 20ms buffer size, it doesn't work!
And it's not on a particular sound preset...
You see before you a very disillusioned man...