Problems with exports of files created with earlier versions.

[KeithSloan]

If experiencing export problems with files created with an earlier versions.

Check if the workbench preference : Export utilized Geant4 Materials : is set

Either : Unset the option.

Or create an up to date version of the Materials section by

1. Opening a new file ( Creates all the GDML Groups)
2. Select all the Objects under the WorldVOL in the old file
3. Copy to WorldVOL in new file
4. Check structure is the same.
5. SaveAs a new version