Sparql update - page goes blank.

[Eric Scott]

I'm playing with Joseki's Sparql update service, and was able to adapt 
the examples to a set of configurations and an html page that will 
update my database, but when the request is submitted, the page that 
launched the query goes blank. Querying afterwards confirms that the 
update was effective.  There are no interesting errors or warnings 
written to the log.  Is there a parameter I need to declare somewhere 
that will tell the server what to return after handling a post to the 
update service?

Thanks,