Sometimes the DbVisualizer GUI doesn't respond to mouse clicks or keyboard input unless either minimise/maximise the window or temporarily switch to another virtual desktop and then back again. After that all works fine. Another issue is that some dialogs are displayed behind others and that dialog windows are kept visible after they should have been closed. The development team for DbVisualizer have experienced the same behaviour with other Java applications on macOS so it seems to be a general issue with Java on macOS. Hopefully a future Java updated will resolve this annoyance.