"Add Link" and other buttons not working with wp_editor()

Hello folks,

I’m modifying a plugin to use multiple instances of wp_editor(). Text formatting is working just fine, but clicking the “Add Link” button in the link dialog box does nothing, and the multi-file media uploader hangs up (browser uploader works fine). Here is the code from one of my instances:

$desc_content = stripslashes($data->event_desc);

$args = array(
	'textarea_name' => 'event_desc',
	'textarea_rows' => '5',
	'teeny' => 'true'
	);
wp_editor($desc_content, 'eventdescription', $args);

Just to make sure it wasn’t my code, I installed the sample plugin from this tutorial:

https://www.presscoders.com/category/wordpress-tutorials/

. . . and had the same problem. Anyone else have this issue?