Not functioning and site crash

I downloaded and installed the navigate module after hearing Chris Shattuck mention it in a webinar on Feb. 19, 2013. I successfully enabled the module but it is not working properly on my end. I'm on a Mac OSX Lion and running Drupal 7.20. In Safari 6.0.2 the steering wheel was missing so I couldn't close the panel (see screenshot). In Firefox 19.0 and Chrome 25.0.1364.99 the steering wheel was there but in the wrong position and covering the search box (see screen shot). Also in Firefox and Chrome the Navigate panel greys out when I am on an administration page making it inaccessible (see screen shot). In addition, and in all three browser, when I click on gear and then click on menu, it crashes my site with the following error message: Fatal error: Call to undefined function menu_parent_options() in /xxxx/xxxxxxxxxxxxx/xxxxxxxxxx.xxxxxxxxxxxx.com/sites/all/modules/navigate/navigate_menu/navigate_menu.module on line 80. The way I got out of the crash was to disable and uninstall the module using drush since I couldn't get back into the administration section of the site, or the entire site, for that matter. I mentioned this to Chris Shattuck and he suggested posted an issue here.

Steve