Dear cantinho
This issue don't relate to ytshortcode.
because you update to k2 2.8.0, so our module not work.
Please go to our module and edit the file: \modules\mod_sj_k2_extraslider\mod_sj_k2_extraslider.xml and find:
<field name="item" type="item" default="" label="K2_ADD_ITEMS" description="K2_USE_THIS_TO_ADD_ITEMS_TO_THE_LIST_BELOW"/>
<field name="items" type="items" default="" label="K2_DRAG_AND_DROP_TO_REORDER_ITEMS" description="K2_DRAG_AND_DROP_TO_REORDER_ITEMS_CLICK_THE_REMOVE_ICON_TO_REMOVE_AN_ITEM_FROM_THE_LIST"/>
=> change to:
<field name="items" type="k2modalselector" default="" label="K2_ADD_ITEMS" description=""/>
with the SJ Scroller for K2 is the same, please edit in .xml file of this module
thanks