How to correct disappearing admin menu? I use the Admin Menu module for my projects. In my Drupal 7 and Pressflow 7 instances, it randomly shows only some menu items.

At first, I thought I could correct this by clearing menu cache. When I went to the front page, I once again got the corrupted menu. 





How do I solve this error, permanently?

I found out this issue is reported in detail, but there is only a workaround (disable menu caching). 

I disabled menu caching with drush vset admin_menu_cache_client 0 as a workaround.
(I am still testing this issue with the menu cache enabled.)

I checked and eliminated JavaScript errors using Firebug browser extension.

I removed BOM from *.js files as suggested in this answer.
Add this to the bottom of your settings.php file:

$conf['admin_menu_cache_client'] = FALSE;