A bit of a panic this morning! It looks like my WordPress install now requires a trailing slash for a URL to display at all. For Permalinks for my posts this is OK because I can just add a slash to my custom structre, but in many posts and pages I have hard-coded internal URLs without slashes.
I have changed my .htaccess file now for a quick fix to add a slash so it's kind of fixed things, but the admin system is still problematic. When I hit "Update" or "Publish", my browser's address bar jumps to http://www.boax.co.uk/wp-admin/post.php with a completely blank screen. The post is updated fine, but I need to hit my back button a few times and refresh.
I'm on an old version of WordPress (3.2.1) so am in the process of backing up everything before attempting an update, but does anyone have any advice?