Edit Thumbnail Error

Using NextGen Gallery 2.1.23, editing thumbnails is behaving oddly. When clicking on the edit thumbnails button, the editor is no longer a pop-up, but appears below the images list. Even though it appears, it lacks a selector to crop the thumbnail. The console is also throwing up an odd error: Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user’s experience. It is not happening when I try to view/meta/rotate. I also cannot click on the image file name itself, when it normally brings the file up in a new tab.

Things I have tried:

• Deactivating all plugins
• Switching to default twenty theme
• Increasing the PHP memory limit
• Removing all spaces and errors from functions.php

Any help would be greatly appreciated.

<img src=”http://www.rogowaygalleries.com/wp-content/uploads/2016/02/Capture.png”&gt;

Operating System : Linux (64 Bit)
Server : Apache
Memory usage : 37.72 MByte
MYSQL Version : 5.6.25-log
SQL Mode : NO_ENGINE_SUBSTITUTION
PHP Version : 5.5.26
PHP Safe Mode : Off
PHP Allow URL fopen : On
PHP Memory Limit : 268435456
PHP Max Upload Size : 64M
PHP Max Post Size : 65M
PCRE Backtracking Limit : 1000000
PHP Max Script Execute Time : 30s
PHP Exif support : Yes ( V1.4 )
PHP IPTC support : Yes
PHP XML support : Yes