Symptoms

K2 menu items in SharePoint Library are not showing up for which K2 solution has been deployed. When the Library tab is expanded, the K2 menu items do not show up. Yet, if another library in the same site is examined, the K2 menu items for that library show up.

 

Diagnoses

Found that the missing icons had to do with the toolbar settings for the SharePoint webpart that displays the library/list.
 

Resolution

The following steps were used to bring back the K2 options:
1. Choose edit page from the gear menu from the Library/list
2. Click edit on list/ library web part (this is the Web Part displaying the actual items on the list or library.), then select webpart, then web part propeties
3. Select ?No Toolbar? or ?Summary Toolbar? for the tool bar type
4. Click ?Apply? (K2 Ribbon Menu items will still show up)
5. Click ?Ok? (the K2 Ribbon Menu will disappear.)
Switching this property back to ?Full Toolbar? and clicking ok should bring it back.