SEF Advance 2008 is generally working great except for this one problem:
Everything crashes if "Redirect non-SEF URLs" is enabled. Check that box and then the browser starts generating a "too many redirects" error. Uncheck it and things work again.
However, we have quite a few non-SEF URLs indexed in Google that need redirecting.
Using version 2.4.6 of SEF Advance 2008.