Hi Wayne,

re:
> This DXF file is imported.
>
> The 'ReconstructCurve' script is run and the V5 beta program closes without warning.

Thanks for reporting this - it's an object refcount bug in some new group processing code in the array curve factory. It doesn't get triggered with the regular use of array curve, the circumstances to trigger it are when a script is using it, when there are "loose" objects used in intermediate stages of geometry processing that are not in the geometry database.

I've got it fixed up for the next release. I'll collect up a few more bugs to fix before putting out a new release.

Thanks,
- Michael