blogger error #104
From Blogger's error code page:
Error 104: java.lang.NullPointerExcept
What it means: An internal code error occurred during processing, and the problem may be caused a variety of factors.
How to fix the problem: sign out and sign back in, try editing and publishing an old post. If none of that works, read the post at the bottom of this page. Phil's suggestions work most of the time.
...which is what I've been encountering all morning so far. (And yes, I tried all of the suggestions, to no avail.) If you're seeing this, then I've finally been able to post. *Whew*.