I blocked something with Opera's content blocker that I shouldn't have. The blocking rule I set now blocks some important part of a web page (probably a CSS file) and it messes up its entire layout. The problem is that the blocking rule doesn't show up when I try to block something on that page. How could I find out what is the rule that messes up that web page?
As mentioned in the comments,
If that still doesn't show you what you're after, fire up Dragonfly (right-click,