Having the same problem here! Same EXACT problem. Really need to solve this. It appears that it is because the user does not have access to "activate" plugins so they cannot upload using the file uploader of simple fields. When we use capabilities manager to allow them to "active" plugins it works but then the user can add/edit/delete plugins AND all custom post types using simple fields are available to them as well making the whole point of the plugin null and void.

Please please take a look at this!

Thanks.

Aaron

You can eliminate the conflict by disabling Role Scoper filtering for file uploads by putting this in wp-config.php, above the "stop editing" line:

if ( strpos( $_SERVER['SCRIPT_NAME'], '/wp-admin/media-upload.php' ) || strpos( $_SERVER['SCRIPT_NAME'], '/wp-admin/async-upload.php' ) )
   define( 'DISABLE_QUERYFILTERS_RS', true );

This will also prevent users from uploading files on the basis of RS role assignments, but I'm not ready to donate any more time to the investigation right now.