Yes, same problem I posted yesterday... funny we both hit it this week. hopefully someone can help?? I know the author of blockUI says he monitors this forum...
http://groups.google.com/group/jquery-en/browse_thread/thread/9ea1cad2f7bc2535/9edbec1ce17d17f4?hl=en&lnk=gst&q=hourglass#9edbec1ce17d17f4