Why am I only hearing left chael playback in both ears? Right side playback is muted.

PC Details:
Windows 10 custom-built PC
Audiobox USB with drivers automatically installed last week
Universal Controller up-to-date
Mainly using Reaper DAW but problem occurs in Audacity, Studio One, and when playing Windows audio back

The Issue:
I'm having the exact problem described in this post: http://answers.presonus.com/2155/one-chael-of-audiobox-usb-is-louder-than-the-other

When listening to audio paed left I hear the playback in both ears without change; however, when something is paed to the right, the audio becomes quieter based on the pan level (i.e. 100% Right = 0 volume). The volume is played back in both ears regardless. Clearly, the playback is restricted to a mono chael on the left chael. But how do I fix the Audiobox to actually understand stereo playback?

I know this is an Audiobox issue. The playback is wrong in every DAW I've used (Reaper, Audacity, Studio One) as well as when handling Windows audio. The forum post suggests using the Universal Controller software which I have but I don't have any controls for the Audiobox even remotely related to his suggestions. Frankly, the functionality of that controller is useless.

Thanks,

I've provided some links and images below as well.

My forum post from earlier last week: https://forums.presonus.com/viewtopic.php?f=164&t=26096

Recording screenshot: http://imgur.com/a/l5aLT

A screenshot inside Reaper options and the Universal Controller app: http://imgur.com/a/TagZF