"Create new article" button generates an error page

[WhySpaceGuy]

To reproduce:

1. Log on as WhySpace on any browser and from any computer/mobile.
2. Do any of the following:
   a) Click the "Create new article" button, or go to http://lesswrong.com/submit/
   b) Click the "Submit new link" button, or go to http://lesswrong.com/submit/?link=True
   c) Click the "Drafts" button, or go to http://lesswrong.com/user/WhySpace/drafts/

Interestingly, I get no issue if I click the "Add new meetup" button. However, doing a), b), or c) will result in an error page titled "LessWrong broke!" containing the following:

[a missing /static/youbrokeit.png image with alt text "Error encountered", linking back to the http://lesswrong.com page]
You have encountered an error in the code that runs Less Wrong. The site maintainers have been informed and will get to it is as soon as they can.
In the unlikely event that you've bumped into this error before and think that no-one is paying attention, please report the error and how to reproduce it on http://code.google.com/p/lesswrong/issues/list'
If the error is localised you might still find awesome Less Wrong content in the Main article area or in the Discussion area.

I've been seeing this since I created the account, so I don't think it has anything to do with the recent linkpost feature. I mentioned the problem to Vaniver, and they redirected me here, and had this to say:

This is the error message for a 500 code, which is a generic internal server error, but the fact that it's linked to your account and not others suggests to me something went wrong with a database entry somewhere?