I have found the same issue as Josep. Many error log lines commenting upon the missing sideblock.jpg. Could someone please post this image?
As a workaround, I have edited my \theme\cornflower\styles_layout.css and removed the non-existent link from the section:
.sideblock .header {
background-image:url(images/sideblock.jpg);
text-align: left;
padding:4px;
}
Thanks
Scott