Menu Block breaks Nice Menus

Hi

Thanks for your great module.

I am using menu block and nice menus on my site. I am using nice menus for the main horizontal nav and a menu block for a context sensitive menu in the left sidebar.

I have found that, when going to pages that have a menu block on them, the nice menu doesn't appear. The menu IS in the source code. If I turn off javascript, the nice menu displays and the menu block doesn't work.

Please help me if you can.

I attach four files. I think the names should be self explanatory

screen capture for page when broken.jpg
screen capture for page when working as javascript turned off.jpg
source code for page when broken.txt
source code for page when working as javascript turned off.txt

I have also logged this with nice_menus: https://drupal.org/node/2169171