in reply to Redirect problem

If there's nothing in the server logs, then maybe the response is actually being sent but your client isn't interpreting it correctly.

In general, when I've got a mystery of the form "this is a simple response, why isn't the browser reading it right?", I've found lwp-request invaluable, particularly the "-e" flag for looking at all the headers. Firebug is what all the cool kids are using for inspecting HTTP requests these days, but I like calling it from the command line.

I know you skipped some of the conditions in the sample, but maybe you forgot a "Status" line? You might check http://httpd.apache.org/docs/2.0/custom-error.html#custom to see whether the comment about a location having no effect is relevant.