When I first noticed that the mysql_manager screen was not displaying correctly, I found that it was due to a JavaScript issue. Upon closer inspection, I realized it was because the translation file had a problem. Since I use Traditional Chinese, I checked the translation file in /usr/local/cwpsrv/htdocs/resources/admin/modules/language/zh and found that the translation in mysql_manager.ini was missing a " which caused the issue. Simply adding the missing quote resolved the problem. Alternatively, switching the browser to the English language also resolved the issue.