This is brand new with 3.0.8. I run sourcetree, go and check some stuff in there. then as I do my work it migrates to the background. Eventually I click on the taskbar icon to bring it back to the front. and all I get is a bleep.
At this point all I can do is right click, end task, and restart it (at which point it invariably decides it needs to spread across half the width of my monitor, which is not helpful).