Hi,
There is an issue on the multiple selection search drop down where you are able to add multiple items from the dropdown but cannot remove them:
Uncaught TypeError: Cannot read property 'split' of undefined

You can reproduce this on the official Semantic-UI site if you go to this link (http://semantic-ui.com/modules/dropdown.html#search-in-menu) look at the second drop down (the "ui multiple dropdown" one) add any item then try to remove it by clicking the cross icon.