I have 3.1.1 running on a VU Solo and on a VU DUO. This website is not clear on where to report bugs.
Bug: when I want to stop a recording I can press the "stop" button (with the square) and then the menu offers me the option to stop the recording, but when I select that, nothing happens.
To stop a recording I have to go to menu --> timer --> and delete the timer.