I’ve just resolved an issue with this blog which prevented me from posting for the past week or so. It took me so long because I’ve been trying all sorts of things: JavaScript debugging (thanks, Firebug!), Unix-host permissions, webserver logs analysis… Eventually it all boiled down to disabling a really old plugin which hadn’t been updated for ages.
Lesson learned: review your blog’s plugins regularly, and don’t hesitate to disable or even delete the ones you no longer use! With the recent WordPress versions, maintaining most of the plugins is really easy.
Thanks for the warning. Sometime ago I actually went and deactivated and deleted all the plugins that I no longer use. This blog confirms the importance of doing so. Thank you so much!