Missing disks when browsing to add library

I use ubuntu 14.04, and have several disks pooled using mergerfs. When I try to add this pooled drive, I click on "browse" to add it to the library. This pooled virtual disk does not show up. Neither do several of the pooled disks. I noticed that the missing ones are /dev/sdg and /dev/sdh, as if there were a limit to how high up the chain the browser will look for the disks. I was using LMS 7.8.0, but updated to 7.9.0, and still have the same problems. Restarting LMS does not help. Does anyone have any idea how to troubleshoot this? It is kind of problematic that this procedure produces no error messages.