If the refreshing doesn't help, try to change your logo from a .jpg to a .gif or .png file.
Sometimes after a few hours, the logo will apear, sometimes it doesn't show up at all.
Giving it a try with another file-extension could perhaps solve this problem.
What is chiefly needed is skill rather than machinery.
- Wilbur Wright, letter to Octave Chanute, 13 May 1900.