Template issue - Dailer StartupKit

Hi,
I uses the template kit Dailer StartupKit for awhile. All go well until this morning.
All images had been switched into the website logo and impossible to make any modification.

Each time I clic on a logo, it show the real image but nothing can be change even I reupload the same image with a different file name.

Can someone knows why and help me out ?

Thanks a lot.
Loki