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.
Try the 'Configure User Groups' button associated with the Users tab. There's a download priority setting there. It's only been very basically tested, but give it a try.
oooh sorry, i never saw that! looks great. i'll test it.
oh by the way, it would be helpful to have a column there in which the priority of the groups is shown.
I second this.