It appears something has broken, for me at least. The editing toolbar is currently not visible when posting a question or answer, yet if I edit an existing one it's fine. I tried FF, IE and Camino on Windows and Mac with the same problem. Anyone else have this issue or do I need to check further on my end?
There was a short period where the editing toolbar was not working, however it was quickly fixed. Please see this post on MSO for more information.