In my Virtualmin interface RoundCube and phpMyAdmin both have new versions reported 1.2.0 and 4.6.1. I upgraded first phpMyAdmin to 4.6.1 then I went back to upgrade RoundCube. Pretty strange it shows now only 1.1.5. I went into Install Un-supported Version and installed RoundCube 1.2.0 without any issues. In section Installed Scripts RoundCube appears as Status = Newer than latest.
Please fix RoundCube installation to 1.2.0 directly from Available Scripts.