When multiple tasklists are added to a page, only the 1st tasklist can have items added to it. When you attempt to add items to all other lists, the page refreshes and the item is NOT added.

It appears that all the AJAX functions only work for the 1st tasklist.

This problem only occurs when the space is using Default theme, it works fine when using Left Nav theme.

This problem does NOT occur in FireFox.