Thanks!
I'm not a programmer and tend to rely too much on Wizards for stuff like this, but am I right in remembering that in the Wizard the line underneath that field said something like "Return to previous page" with a checkbox? I guessed that the user would be returned to the page they had come from, if I left it empty, and checked that box. Which is desirable, yes?
So what should I put in that empty successRedirect, if I want the user to land back on the page they were trying to access??
I have tried putting various other paths in that field, but all of them return the Log In page. Is there something else wrong?