I have updated to this beta version. I wasn't expecting such a quick fix for that dpcmd, I went ahead and did what I needed to do manually so I'm not able to re-test that function at the moment (though I will on my next failing drive replacement/capacity upgrade).
However I do notice that with this new beta the UI is far less responsive. It hangs for a few seconds every 15-20 seconds or so. Similarly, when I click "Re-balance Now", it takes around a minute before anything actually starts happening. Generally, and I don't know if it's just me and the increasing demands I'm placing on the software in the form of adding more drives to the server, but the UI for all three programs (Scanner, DrivePool, CloudDrive) appears to be getting less and less responsive from when I first started using them.