Filezilla 3.7.0.3 exits (crashes) on connection attempt

Using Filezilla 3.7.0.3 on Mac Mountain Lion...
When trying to connect to port 990 with:
FTP
Require Implicit FTP over TLS
Passive

Fillezilla crashes/exits and log show only this:
2013-05-29 10:13:49 32910 3 Status: Resolving address of ftp31.example.com
2013-05-29 10:13:49 32910 3 Status: Connecting to (the IP address):990...
2013-05-29 10:13:49 32910 3 Status: Connection established, initializing TLS...
2013-05-29 10:13:50 32910 3 Status: Verifying certificate...

Any thoughts on why this is happening?
(When using Transmit or FireFTP, no problem.)

Thanks