I have Firefox 2.0.0.13 and 2 domains – one is absolutely blank and very new and the second is my permanent domain with blog. Both domains are on the same hosting. When I’ve updated WordPress from 2.3.3 to 2.5 on my main blog I’ve got the same error (“Your attempt to edit this post: “Test post 2″ has failed.”). It was very strange for me, so I set up WP on the second domain and tested again. And all worked perfectly.
Ok, I’ve deleted my main domain from hosting, back up and dropped DB and initiated installation again (no plugins, I’ve only copied my theme). THE SAME ERROR :o((
Now I’m trying to re-setup the blog etc.
Could you please help me? No errors in the error log, I have no idea what’s happening.