Marketpress breaks WordPress new category creation bug

Hi,

Marketpress 2.7

Wordpress 3.4.2

Whenever I activate Marketpress, it breaks the Add New Category button functions. (It breaks any custom taxonomy add new category functions too).

Adding a category wont update itself. But if you refresh the page you will see it there.

However, when you try to delete the newly added category, there will be an error.

Please help!