BlockUI breaks under 1.4.1

BlockUI breaks under 1.4.1

Have a asp.net mvc project using jquery-ui-1.7.2. and BlockUI. When I changed jQuery version from 1.3.2 to 1.4.1, the CSS pertaining to the block ceased to render. The functions fired (verified by in-line alerts) and firebug had no complaints.

Moved back to 1.3.2 and the blocker rendered perfectly.