Access denied Permissions forum message

When logged in as administrator I get the following message when Creating a New Forum Topic & then immediately deleting it. It does delete the topic, but once it's deleted you get the message below.

Access denied. You must have special permissions to access this area or you are not logged in.

Probably because it's using the url from the cache in your browser to try and open a page that no longer exists. Unless it's causing some other issue, I wouldn't sweat it.