I just upgraded to Sourcetree 2.0 on my Windows 10 desktop. I have my taskbar set to auto-hide (it only shows if I move the mouse cursor near the bottom of the screen), and having Sourcetree in fullscreen mode prevents this.

When I move the cursor to the bottom of the screen, the cursor changes to the up-and-down-arrow "resize window" cursor, and doesn't show the taskbar.

Not a major issue at all, just a little annoying.