i tried to set a text instead the logo, it worked well once in english, by switching the language, i got following:

a:3:{s:5:"en_US";s:35:"Jean-Philip Garigon Photography";s:5:"fr_FR";s:34:"Jean-Philip Garigon Photographie";s:5:"de_DE";s:31:"Jean-Philip Garigon Fotografie";}

and i can not come back in english , i have to install default then again effervescence , after 4,5 tries it worked. looks like i can not add different text instead of logo image
jp

That is indeed a bug in the theme. It will get fixed in tonight's build.