I installed the 3.1.2 version of the tool on Ubuntu 17.1 and it asked me for the root password. I typed it and it doesn't show anything. It doesn't work. I've tried to start it with command kdesudo partitionmanager but it doesn't work. I've tried with su, sudo too but the result is the same.
Some system configuration issue. I don't think this is a bug in partitionmanager. In any case, latest development code no longer needs sudo, su or kdesudo, so would be fixed anyway. If you want, you can join #partitionmanager channel on Freenode IRC, I can try to help you out.