I would say that half the time I use the Item Directory, I get some sort of warnings at the top of the page. For example, I just looked up "Calvins Cadogre Toy" and received these two warnings at the top of the page:

Warning: Invalid argument supplied for foreach() in /www/subeta.net/explore/directory_building.php on line 47

Warning: implode(): Invalid arguments passed in /www/subeta.net/explore/directory_building.php on line 60

Again, this doesn't happen all the time. For what it's worth, I'm using Google Chrome Version 53.0.2785.116 (64-bit), Mac OS X (Version 10.11.6).