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.
Did you try using a bitrate filter?
I do beg of bitrate option in wishlist
I do intend to eventually have wishlist results associated with the last filter you were using for them. You can already filter in bitrates of your choice when viewing wishlist results, but this way you'll only have to do it once, and be able to change it later if you so desire.