When you erase "logo.gif" in the "Show Logo Image?" option of the HEADER config page, and save it, logo.gif is still there next time (this is minor because logo does disappear from front page, but will come back if you do not clear the field each time before you do a save).
Fixed here temporarily by making logo.gif a 1px image of background colour. :-)
Thanks very much for all your hard work. I will be donating.