I just updated to the latest nightly build and noticed that the separate CBSubs admin menu is now incorporated into the main CB admin menu. In searching for a way to restore the separate menu item, I came across the "display mode" dropdown in mod_cbadmin. Out of curiosity I set it to table mode and immediately on saving was greeted with the attached screen, with no way out of it.
I was able to get back by disabling the module in the database, changing it back to dropdown and re-enabling it, but I'm now curious about the purposes of those different display modes for mod_cbadmin, and also if it is possible to get back the separate menu item for CBSubs.