Blank window on second monitor

Source Tree gets blank screen when moved to a second monitor, regardless of the window being minimized or maximized. 

I've discovered this issue is dependent on the speed with which I drag the SourceTree window onto the second monitor. If I drag it very slowly across the point where it re-scales (as >50% of the width moves onto the second monitor) then it seems to work itself out and everything is okay. If I drag it across this point more quickly (a normal speed) then it ends up black, as previously described.