Close button sends client to the tray, statically linked Qt for OSX.
See the Changelog for list of features and fixes currently only available in the nightly builds.
New in tonight's build, the ability to prioritize the download order of users in specific groups, for those of you who want finer-grained control over their upload queue. By default all user groups are awarded a download priority of 0, which means the downloads of users in that group won't be processed in any special order. Raise it to 1 however by means of clicking the 'Configure User Groups' button at your User List tab, and your client will process their downloads before all but those in groups with even higher priorities. A user who is in more than one group will be given the priority of their highest-ranked group. See the download page for Windows, Mac and Linux builds.