Why are the edit and delete buttons disabled?
This is likely because the Function is 'Read Only'. When this happens users can access existing Adaptable Blotter Objects but cannot edit or delete them or create new ones. It might be the case that the item in question can never be deleted (e.g. if its the 'Default' layout).
Why are some rows missing from my grid?
Check that there are no Column Filters applied, or that there there is no active Advanced Search.