Hi, I had  opened a bug for this but I think it got lost. Or I didnt promote the bug enough.

There is a bug in the python API for the new skinning, I think.

Posers export function is also affected.

The functions that tell vertex positions have now a different behaviour when asked for world coordinates. This affects weld vertices.  In classic skinning both vertices involved in a weld receive the same world coordinate (=after weld) but in the unimesh skinning, you receive the before-weld (unwelded) coordinates. This is the deviation that my exporter detects.

In classic skin its all good so I suppose its better to switch back to classic skin when using PML (can you switch back and forth without loosing data?)