Hello

with ten blocks it works fine , but if I added another block , all blocks content disappear, clicking in any block title will move it to last item but nothing appears in block content area
See the Capture Here
this happens only in vertical status
version:7.x-2.0-beta3
drupal:7.15
PHP 5.2.16

thanks

Files: 
CommentFileSizeAuthor
Capture.JPG141.2 KBayalsule