Add a post and submit it. it takes you to the post.. all good. Delete the post using the delete button in the post toolbar, it takes you to the edit view rather than back to the topics view.

Can't reproduce this. Are you using a custom theme?

Our theme is called _default, not sure if the theme has been customised, but if it has it would only be the module.css to change a few colors or font sizes etc. I made sure that all the templates were set back to the default installed templates (manually updated each one). I can reproduce this on our forums using ie 8, firefox 3.6 or chrome. It only seems to happen if you immediately delete a new post that you just created , not something I would ordinarily do but was testing stuff.