Thanks ach. I think I managed to find it. The issue was seemingly fixed (will have to check though) when I disabled the
Statistics plugin. Before disabling it, if I right clicked and copied the link that the image was pointing to, I was directed to a site:
http://www.[mysitehere].com/lib/exe/fetch.php?media=%20[wiki:image.gif]
(my square bracketed changes). Going to that link gave the error message below
Array ( [0] => Array ( [lvl] => error [msg] => DB Error: Table 'myusername_stats.stats_lastseen' doesn't exist REPLACE INTO stats_lastseen SET `user` = 'trinh' [allow] => 0 ) [1] => Array ( [lvl] => error [msg] => DB Error: Table 'myusername_stats.stats_media' doesn't exist INSERT DELAYED INTO stats_media SET dt = NOW(), media = [wiki:image].gif', ip = '163.1.236.106', ua = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.94 Safari/537.36', ua_info = 'Chrome', ua_type = 'browser', ua_ver = '0.0', os = 'MacOSX', user = 'myusername', session = '1410168693107-6579f2fc069a872b52a529b4155ca714', uid = '1402525135191-23846', size = 891095, mime1 = 'image', mime2 = 'gif', inline = 1 [allow] => 0 ) )
with further warnings. I realized that when upgrading the Statistics plugin, you also need to upgrade the database. There is a snippet of code on the db.sql file for the statistics plugin that you need to copy and paste into the SQL query section of myphpadmin. That did the trick.