You upgraded from 1.04. There isn't any backward compatibility with version 1.04.

Try deleting hostslist.txt and resumelist.txt in the xolox directory.
When deleting the resumelist, your running downloads will be destoyed.

Sorry for the inconvenience.
Try to enable auto-upgrade. That will always give you the newest version and will guarantee you backward compatibility.

Greets,
Pasman