FTP Problem using Opus 9

I am getting an error message when I try to FTP using Opus 9. I have checked server name, user name and password and all appears to be correct as I can enter as usual using Opus 10 on a different computer.
Using Opus 9 the error message is:

'An error occurred reading folder

FTP on OPus 9 has worked well for me until I started getting this error message.

I would be grateful for some advice on how to rectify the problem,

Best wishes, John M.

Please try the suggestions in the FTP doesn't work FAQ.