All url's show default controller index function

[eluser]jplanet[/eluser]
I've seen others post about this but could not find a solution that worked for me in any of the existing threads. No matter what URL I go to, only the default controller is called, and I get three "Undefined offset" errors, each on a different line of libraries/Router.php.

Here is my htaccess code:

Code:

DirectoryIndex index.php

    RewriteEngine On

    RewriteBase /
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule ^(.*)$ index.php/$1/ [L]

A possibly relevant line in config.php:

Code:

$config['index_page'] = "";

Content of routes.php:

Code:

$route['default_controller'] = "welcome";
$route['scaffolding_trigger'] = "";

$route['portfolio/(.+)'] = "welcome/portfolio/$1";
$route['gallery/(.+)'] = "welcome/gallery/$1";
$route['contact'] = "welcome/contact";
$route['sendContact'] = "welcome/sendContact";
$route['(.+)'] = "welcome/content/$1";

The application is running fine on my development machine, and I have several other CI sites doing just fine. I re-downloaded the latest version of CI for this project, figuring I might as well have the latest and greatest, but it's not playing well with the shared Bluehost account (I have other CI sites on that server doing just fine with older versions of CI)...