install problems

i'm running drupal 5.1, and am having problems getting this module working. i have no non-core modules other than this one installed. i downloaded the 5.x version, placed it in sites/all/modules, applied the patch (by hand) and checked the enable box in the admin module interface. the additional settings for editing a menu item appeared, but they don't seem to do anything. i poked around a bit, and it turns out that the menu_per_role table was never created.... so i created it by hand (using the info from the mysql case in the .install file). [disable-reanable module, restrict menu items again] the menu items are still viewable by all. whenever i add role restrictions to a menu item, no data is being entered into the menu_per_role table. any ideas? i tried setting the module file permissions to allow everything to rwx them, but it didn't help. thanks in advance for your help. please let me know if you need more information.