I am getting this when I am trying to add a very long Views url shortcut. I also noticed Views litters the url with unused filter values, but that could be a separate issue.
PDOException: SQLSTATE[22001]: String data, right truncated: 1406 Data too long for column 'link_path' at row 1: INSERT INTO {menu_links} (menu_name, plid, link_path, hidden, external, has_children, expanded, weight, module, link_title, options, customized, updated) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7, :db_insert_placeholder_8, :db_insert_placeholder_9, :db_insert_placeholder_10, :db_insert_placeholder_11, :db_insert_placeholder_12); Array ( [:db_insert_placeholder_0] => shortcut-set-1 [:db_insert_placeholder_1] => 0 [:db_insert_placeholder_2] => admin/items?field_device_name_value_op=contains&field_device_name_value=&field_controller_target_id_op=in&field_controller_target_id[0]=1905&field_controller_target_id[1]=1906&field_controller_target_id[2]=1904&field_controller_target_id[3]=1903&field_controller_target_id[4]=2199&field_shapeways_id_value_op=empty&field_shapeways_id_value[value]=&field_shapeways_id_value[min]=&field_shapeways_id_value[max]=&field_longer_edge_value_op=%3E&field_longer_edge_value[value]=0&field_longer_edge_value[min]=&field_longer_edge_value[max]=&field_sell_on_amazon_value_op=or&field_sell_on_amazon_value=All&field_printable_value_op=or&field_printable_value=All&field_default_pic_ok_value_op=or&field_default_pic_ok_value=All&field_photo_count_value_op=%3E&field_photo_count_value[value]=&field_photo_count_value[min]=&field_photo_count_value[max]=&field_longer_edge_value_1_op=%3D&field_longer_edge_value_1[value]=&field_longer_edge_value_1[min]=&field_longer_edge_value_1[max]=&field_brand_tid=All&changed_op=%3D&changed[value]=&changed[min]=&changed[max]=&field_md5_match_value_op=or&field_md5_match_value=All&field_md5checksum_value_op=%3D&field_md5checksum_value=&field_year_released_value[value]=2014 [:db_insert_placeholder_3] => 0 [:db_insert_placeholder_4] => 0 [:db_insert_placeholder_5] => 0 [:db_insert_placeholder_6] => 0 [:db_insert_placeholder_7] => -46 [:db_insert_placeholder_8] => menu [:db_insert_placeholder_9] => Administration [:db_insert_placeholder_10] => a:0:{} [:db_insert_placeholder_11] => 0 [:db_insert_placeholder_12] => 0 ) in menu_link_save() (line 3166 of public_html/includes/menu.inc).