BJ Background jobs won't die

I am having a problem using the bj plugin and am wondering if someone
can help. Basically we use attachment_fu to upload images to our
server and then send a job to bj to upload those files to S3 and then
delete them from our server.

This all works fine except that when we try to stop mongrel we get the
following error:
"Waiting for 1 requests to finish, could take 60 seconds."
After about 60 seconds it kills the process.

The background jobs have finished but the process seems to be hanging
around. If I wait about a minute I am able to restart mongrel but I
would obviously prefer to have it shutdown correctly. Any ideas?