I just installed the recent new version of Source Tree on my Mac running Yosemite. For the life of me, I cannot drag a repository in the bookmark view into a new group I create. I've tried every manner of dragging, hovering, expanding, etc. I tried dragging it into the group partition header, dragging underneath, off to is right or left, onto its little arrow expander, nothing puts the repository actually into the group. Can anyone help with this seemingly simple task?