Clicking Prefs: Encryption: Validation hangs TM under OSX Yosemite

I'm on a 8GB RAM late 2009 iMac running Yosemite (see attached for more)

1. Launch Tor Messenger

2. Bring up Preferences

3. Click Advanced

4. Click the Validation button.

-> Within about a half minute, Tor Messenger will hang, requiring a force quit of application.

Trac:
Username: jefe001