Post Icons Not Visible at Forum Display

[Dr. Bantham]

It must be a simple fix, but I have searched through settings and the forums to no avail. For some reason, post icons are not displaying in the second column of the forum display when listing threads. There is a only a blank column shown after the thread status icons, regardless of post icon selected. The icons are visible when viewing specific threads.

[Dr. Bantham]

Another member here sent a PM indicating they were having the exact same problem. I can not find an option setting for viewing post icons. I have disabled suspect mods to no avail. All styles behave identically. Does anyone have an idea of why this might be happening?