After clicking "Reset" a window opens listing the uncomitted files. To the left of the file name is a check box but it is squished horizontally so that it is nearly unusable. The ability to move the separator bar (between the file list on the left and the differences on the right) was not working. I resized the window and then the separator bar would work so that I could access the check boxes. Once it was working it wasn't possible to move the separator bar back to the left far enough to repeat the initial view; the movement was limited. But that limit wasn't being applied upon opening the window.