it seems that you can only mirror the parameters if you mirror them separately. and don't forget to scene.Draw() or scene.DrawAll() at the end.

```

if transitions().IsYRotate( parm ):

    parm.SetValue( -parm.Value() )

if transitions().IsXTranslate( parm ):

    parm.SetValue( -parm.Value() )

```

and the forum appears to be borked again.

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