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.
Definitely! I would also like to see an upload progress bar for Windows 7 (as well as for Vista and 8) as an option. That's quite annoying checking an upload tab once in a while to find out there is another leech not even willing to write you back when you kindly ask to share files. Such notification would be highly appreciated.