I don't know if the ultimatum posters are the same individual, but I'd like to add my vote for fixing this ASAP. Such browser behavior is very annoying; no warning that my own default was changed and no way to fix it (at least let me select one of the 'Other search engines' as default; still annoying but at least there's an easy UI fix). Having to type that extra letter when I search with Bing now isn't much effort, but it constantly reminds me of this problem.