Profile not visible when running from DVD

Hi,
I'm trying to burn thunderbird to DVD along with my profile as a backup of my email that I can easily view in the future.

I've included the Thunderbirdportable.ini file as suggested on the help pages, but for some reason, when the RunLocally flag is set to true, my profile disappears and Thunderbird insists on creating a new one.

If this flag is set to false, I get a write error (as expected when running from a DVD) but I can see my folders within my profile, unfortunately thunderbird then hangs when trying to view the contents.
Any ideas?