Which mistake?
Actually using the Internal engine, or something else?
The disk is full because during the 3D visuaizing process, a temporary file that contains all of the GDL scripts "constructed" as individual elements and the light and surface calculations are stored.
There's not enough room on the disk to contain this file. It could be gigulonz in size.....
does it not happen with LightWorks?
Dwight Atkinson