Version 417 - Menu works like a charm, animation goes from top to bottom (on hover) normally; Version 611 upgrade - Menu breaks, Animation starts from bottom to top. (on hover) This is unexpected and breaks prior application functionality; We've tried replacing the binaries from 417 to 611 and back again to confirm this.
There was a problem with menu expanding when used on the same page with RadDropDownList. The problem is fixed in the latest 2013_2_717 version.