Drupal cannot add content

I've just migrated my Drupal site from one host to another, and everything migrated perfectly - but I cannot "Add Co开发者_Go百科ntent" to my site. I'm not sure if it is related to any modules, but I don't believe I've changed any modules since I've last added content.

1. Login as the admin user
2. Go to http://YOURSITE/node/add
3. Choose a content type and create some content.

if that doesn't work then something in drupal core/DB is rather messed up.