mythiix, please download the file http://muse.adobe.com/assets/ftp2014fix.zip, unzip it, and save the contained file "ftpPrefs.xml" to the following location:
On Windows: %appdata%\Roaming\Adobe\Adobe Muse CC\2014.1 (You can copy and paste this in the Path bar at the top of the Windows Explorer window.)
On Mac: ~/Library/Preferences/Adobe/Adobe Muse CC/2014.1 (You can copy and paste this in the Go To Folder dialog using Shift+Command+G in the Finder.)
I believe the hang on open is a result of Muse attempting to check to see whether In-Browser Editing has been used to make updates to your published site and the FTP server on the host being slightly misconfigured. Muse uses FTP Extended Passive Mode (EPSV). It's generally the preferred mode for optimal performance, but we're finding some hosting providers have FTP servers configured such that EPSV is not supported or EPSV only works if you're inside the same firewall as the FTP server. The ftpPrefs.xml file above, turns off EPSV mode. So if that is the problem in this case, putting that file in place should enable you to successfully open your .muse files and upload to your FTP host without hanging/crashing.
Please give this a try and let us know whether or not it enables you to open your files and use File > Upload to FTP Host from within Muse. Thanks.
