I removed some widgets from the dashboard in the wrong way (using unset() on $wp_meta_boxes) and as a side effect my dashboard widget area is now split into 4 columns, but with just the first 2 having the normal default widgets in, thus the page is squashed.
Is there a way to change the amount of widget columns in the dashboard? They are all active as I can drag and drop the widgets around, but now 4 is too many. I am using WordPress 3.1.3 so don’t have the new admin interface yet.