FTP Opus 10

I just upgraded to Opus 10 (64 bit) from Version 9, also 64 bit. Now, I'm not able to log on to FTP sites that are in my address book and previously used daily. I have confirmed that the sites are running by logging on in Internet Explorer. I have also tried with and without using the PASV mode. Below is the error log.

257 "/" is current directory.
227 Entering Passive Mode (50,74,20,52,14,230)
500 '****': command not understood.

Help...

-Frank