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.
It doesn't produce a crash message? I think I know why it's not reopening, I'll endeavor to provide a fix for that very soon.
it does produce a crash message, yet i always click reopen.
other two choices are ignore or send report
If you can post the crash report here it would help me try to make sense of this issue. See this post for more information.