In Progress Can't change themes

[El_Stino]

When I want to change the theme on my Sony Ericsson Xperia Arc S (Lt18i) , I just get a gray screen. So I can't change anything. Even when I want to change the sound of my alarm I get this screen. I hope this can be solved. You can see the screen I get in the photo that I uploaded.

 

[Pele]

please do the following :

settings > apps > all tab > scroll to theme manager > clear data, cache from theme manager app

try it again