Installing D7 RC1 on top of MAMP fails

Using the install walkthrough rather than directly editing the settings.php file, the procedure gets hung up. I've reopened an existing bug #873114: PDOException: SQLSTATE[42000] when installing Drupal. Here's the text of the error I'm encountering:

The website encountered an unexpected error. Please try again later.
Error message
PDOException: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') ORDER BY fit DESC LIMIT 0, 1' at line 1: SELECT * FROM {menu_router} WHERE path IN () ORDER BY fit DESC LIMIT 0, 1; Array ( ) in menu_get_item() (line 426 of /Users/adamrice/Sites/notbob/includes/menu.inc).

Database tables are being created, so it's not clear to me what's going on. Could this be something peculiar to my system? This is with MAMP 1.8.3 and OS X 10.6.5, fwiw.