Permalink changed, then changed back, now infinite loop!

Hi all,

I was deciding on the permalink name for a page and when I went to edit it, it redirected to the new one perfectly.

Then, as is my habit, I changed my mind and wanted to use the original permalink so I changed it back. Unfortunately now it goes into a kind of infinite loop and puts up an error message.

How do I remove the original redirect for this and just have the page where I want it? Is it somewhere in the database or somewhere else?

I had noticed it before when I was doing a test post in a category and if I deleted a post and then later that day or month (depending on the permalink structure) the permalink would be say http://www.mysite.com/2012/1/test-2 rather than http://www.mysite.com/2012/test

How is this resolved, does anyone know?

Thanks in advance
Stephen