Disappearing columns in "My Computer"

I've configured Dopus 9 so that when I view My Computer, the total size and free space of my drives are shown. I've also saved this as my default lister and starting point. However, there are times that the total size and free space columns disappear! How do I fix this?

See the 3rd item in the list of FAQs: Save settings to System Folders (e.g. My Computer, Desktop, Control Panel)