I formated my pc this day, and i installed Flashfxp..
I had the same problem..
So i installed it, and i installed a virus scanner etc..
So after i did that, i wanted to download something from ftp, and it didn't list !@#$%^ I was like what the .....
So i checked what i installed, And the only thing that i could find was the virusscanner, so i uninstalled it..
AND IT WORKED.. My virusscanner was the problem!
I use: Bitdefender (bitdefender.com)
I hope this helps
Grtz Bart