Problem with batch create plugin

Hello,
I am having problem with the batch create plugin. I seem to be able to load and process the batch, as the "bar" gets to 100%, but it just hangs there. After about 15 minutes of waiting I press [Back] on the browser button and get a 404 error. Nothing ever seems to get out of the processing queue.
I have tried the standard and beta 1.1 versions, same thing...

Any idea what may be causing the hangup?

Perhaps this would yeild a clue (the URL after I back navigate)

http://{My site name here}.org/wp-admin/ms-admin.php?page=batch-create&updatedmsg=Queue+processing+complete.+%3Ca+href%3D%22http%3A%2F%2F{My site name here}..org%2Fwp-content%2Fuploads%2Fbatch-create%2Fbatch_create.log%22%3ESee+log+file.%3C%2Fa%3E&updated=true

Seems like some sort of permalink error perhaps.