Many thanks for having taken the time to reproduce. Appreciated.
Following your answers, something has become evident for me which I didn't notice before:
Indeed, I remembered being bothered in the past with uppercase / lowercase and that's the case here again.
switching from LibSnarf to libsnarf just half an hour ago in the ClassvolumeConfig make the volume open without issues.
I can also build it and the class objects are present in my palette now. For this part (presence in the palette) I don't known if this has somehting to do with my fresh re installation or with a case sensitive issue because I don't remember how I declared it in my previous trial.
Don't know if you think that an improvment consisting in forcing the classvolume name in lower case could be useful for anybody else in the future or at least a warning if classvolumeconfig name is not matching the global volume liste declaration ? I let you judge on the criticity of this.
Thank for your help that finally greatly helps me to find the root cause.
Snarf