fail

The post I hoped I wouldnt have to make but Apple messed up in a way I find hard to excuse.

Trying to choose a mesh template from the wizard causes QC to crash, even on machine with suitable GPU.

Some existing compositions that use meshes dont work anymore, no crash but rather an empty space where the mesh should be.

Some mesh compositions may still work (eg apple example that is called Mesh Filters.qtz).

I havent narrowed down the exact nature of which mesh stuff still works as Im too tired today, maybe I made a mistake about these latter problems but the Mesh Filter template crash is a cert.

Only positive thing I have to say is that some other uses of CL in QC now seem to be working on CPU (on machines with unsuitable GPU) without having to tick that hidden preference.