The WYSIWYG post editor buttons are not currently appearing for some people using Blogger in various languages. We've verified this for French, Italian, and UK English, but it may affect others as well. If this is affecting you, please change your settings back to English for now and that should work. You can do this by clicking the "language" link at the very bottom of your dashboard (or by clicking here) and then selecting the first "English" option (but not "English (UK)"). We are working right now on getting these features back and working again for all languages.
Update: This should now be fixed. Feel free to change back to your preferred language setting, following the link above. If you continue to see problems with the posting form, please clear your browser's cache and cookies, then login again.