My problem is that in Twenty Twelve the dropdown menu dissapears before the cursor reaches next tab, and I can’t acces the items in dropdown menu. I think I need to modify something in css (.main-navigation li ul li a), but I can’t figure out what. Here is my website.
It’s caused by too much negative margin on .main-navigation li a:hover.
Also, it seems all the changes are done directly to theme stylesheet (instead of Custom CSS plugin or Child Theme) making it hard to debug. Please consider transfering over all the changes to Custom CSS plugin (or Child Theme), and restore the theme itself to original.