I just moved my site to a new shared host in the same environment as before. Also upgraded to 3.4.2 of WP. Now it has stopped working. Green ticks and red x's still appear, but when I click on them I get an error message "Apologies, but something seems to be amiss. Your link is probably unaltered". It was working great before I did these two things. Any idea what might cause this to happen? Permissions issues?
I tried uninstalling and deleting the plugin, then downloading and reinstalling it again, but no joy. The only related plugin I use is Broken Link Checker but it's been there all the time. No caching plugin in use at the moment.