If you can schedule a "cron job" from your server or elsewhere, and you're comfy with coding, this might help...
1. Make a copy of "wp-cron.php" and name it something else.
2. Under "require_once('./wp-load.php');", enter the line "echo wp_hash('187425');", followed by "exit;".
3. Delete everything below that line, but remember to keep the PHP close code at the bottom.
4. Upload the file to your server and call it from your browser. You'll see a very long string of gibberish. Copy that. You can (and should) delete the file from your server when done.
5. The address "http://yoursite.com/wp-cron.php?check=xxxx" (where xxxx is that gibberish string) will trigger your site's scheduler. Since our site typically schedules entries for :00 and :30, I've created a cron job that calls that address at :01 and :31. Seems to work, knock on wood.
Normally your own site calls that address when needed. I don't know why it's not working on 2.7. There's some talk it might be a "curl" problem, but if I understand how the new http.php API works, I don't know whether that's the case -- I've been able to update plugins with 2.7, and presumably they use the same method.
Other than that, I like what I'm seeing with the new version. But there's always a catch...