Thanks for the detailed report deraen. The culprit turns out to be the global menu in 11.04 (and the netbook versions). It works by looking at each applications menu, then making a copy of it on the top panel, and hiding it in the window. However, because GTK wasn't designed for this, it's not able to do it properly, and doesn't pickup new menu items added on the fly. This causes Sublime Text 2's menu to disappear when the snippets load in and the menu is refreshed. I'll add some workarounds to keep it happy in the next version.