Permalink issue when switching hosts

My site is https://www.webthingsconsidered.com

I just switched to dreamhost (unix/apache) from a windows/iis host. My site was using the /index.php/ style of permalinks on the old host successfully. After switching, it’s not working anymore. I get the “No input file specified.” error when trying to access a permalink.

I have an empty .htaccess file in the web root (dreamhost seems to create one for you with all of the wordpress rules in it if you delete it, so I just emptied it out), and the same permalink structure setup in wordpress (/index.php/%year%/%monthnum%/%day%/%postname%/) as before. I’ve tried with and without the php.ini file just to see if that was the problem, and it didn’t help.

Any advice for clearing this up?