Hi Claes,
ClassVolumeLoad was moved under WbEnvironment, as shown. When File/Open Volume, Functions/Show all volumes, the custom class object is not listed. But, after an Update Classes in VolTest, then the custom class appears as you explained.
When opening a a simple PLC test program in VolTest, the DES custom class folder is not available:
Unlike, when the custom class volume is directly embedded in the project, as shown from project lss:
What is missing?
Thanks again for your help!
/Ron