That looks like what I was seeing with my r-box only it was CGminer detecting my Antminer U1's that were running on BFG. To get it to stop I had to place a limit on the number of devices CGminer initiates and starts once it has my R-boxes started it reaches the max device limit and stops scanning for more devices. I was looking for command line statements to load just the R-boxes but someone told me how to do it this way and it works so I left well enough alone.

The steps for controlling USB device scan are listed in the Advance USB section of the readme.... (probably around line 319 if I were a betting man since that is where ckolivas pointed you to).