In the meantime, I have come up with a work-around that avoids the broken function; you can add this to OJS by applying the patch at:
http://pkp.sfu.ca/ojs/download/patch/co ... mizer.diff
...which will temporarily remove some functionality that you probably aren't using (unless you've been developing your own plugins).
Hi, just to add to the reports. Our journal is suffering this bug as well, and I've tried applying the temporary patch. Unfortunately, it appears to work on our test server running Apache, but dies (it returns a 404 when accessing the index.php redirect) on the production server, which is a shared host running IIS 6, PHP 5.2.1 and Zend Optimizer v3.2.4.