The same issue is occurring for me. I have no other plugins installed on a fresh install of 3.1 with Adminimize version 1.7.14.
I’ve clicked to hide “Comments”,”Editor”,”Editor”,”Links”……..the options save, but the menu items still appear after the save. This seems to occur on everything I’ve tried.
This might help. I have also installed the White Label CMS plugin on a fresh install of 3.1 (it also allows the hiding of menus, but has less options). Hiding any menu with it also has no result.
I’m calling this as something occurring because of a change in WP 3.1. It makes no sense for two different plugins, who do similar things, to have the same issue unless WordPress Core is the problem.
Something must have changed in the update that is causing this behavior, or else this is a strange coincidence