Blank Page Returned with post.php

When I create a post for the first time, I can ‘save and continue editing’…I’m returned to the post editor. After that first time, I get a blank page (in Firefox) when I try to save and continue edit. In IE, I’m returned to the Dashboard instead of the post editor.

I’m having no problem with regular ‘save’ or with ‘publish’. Only with save and continue edit.

Any ideas from anyone? I’d be grateful. Thank you. ~ kat