Using 2.15.0 on OSX 10.12.6, when I open git gui, and then attempt to stage multiple files as such: * Left click first file * CMD+Shift+Click last file to multi-select all files * CMT+T (shortcut for Stage to Commit) Only the file I selected with the first Left Click is staged and my selection disappears. I'd be happy to provide more system-level info if there's issues with reproducing this on other machines.