2 - When trying to add links from admin this error message was displayed.

PHP Code:
Catchable fatal error: Object of class queryFactoryResult could not be converted to string in path\to\zencart\admin\includes\functions\html_output.php on line 333 
Without fixing these errors (mainly number 2) I am unable to add any links!
Alex,

Evidently this has something to do with line 365 in admin/links.php
PHP Code:
echo zen_draw_pull_down_menu('links_category', $categories_array, $lInfo->links_category, '', true); 
and its interaction with this function in admin/includes/functions/html_output.php
PHP Code:
function zen_draw_pull_down_menu 
at line 325