Can't log in to the TDN Wiki

I'm having issues logging in to the TDN Wiki - I just purchased a liscence for T2D today.

Everything on the main GarageGames site works fine for me - but when I try to log in to the Wiki I get the following SQL error:

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A database query syntax error has occurred. This may indicate a bug in the software. The last attempted database query was:

(SQL query hidden)

from within function "User::addToDatabase". MySQL returned error "1062: Duplicate entry 'Matthew Jones' for key 2 (localhost)".
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I've not logged in to the Wiki before, and I guess it's entirely possible that there's another user with my name (I've met three in my city alone). Any way around this?

I'm using Firefox v1.0.7.

Thanks in advance.

Edit: Question reposted in the appropriate forum.