NOTE: to re-start the wizard again - I had to delete the 'settings' folder on the server and re-transfer these files and folders back over - then the wizard started up again ....viola !
The references I found seem to relate to earlier versions of EZ.P and didn't work on the latest (in terms of re-starting the wizard)
It does sound like you may have run out of memory though ... but others may have a much better idea about why this happened....