FireFTP no longer working

For some time FireFTP no longer works, and I thought it was because it was no longer compatible with FF, but should be as far as I can see.

FireFTP launches just fine, and when I try to connect to a site the logs shows that everything is fine. for example:
220---------- Welcome to Pure-FTPd [TLS] ----------
220-You are user number 1 of 50 allowed.
220-Local time is now 07:58. Server port: 21.
220-IPv6 connections are also welcome on this server.
220 You will be disconnected after 15 minutes of inactivity.
AUTH TLS
234 AUTH TLS OK.
PBSZ 0

But nothing is shown in the right side panel (the menu options still says "connect" rather than "disconnect", thus indicating that I am not connected).

FireFTP 1.0.4
Firefox: 3.0.7 (Running as Portable App)

Has worked just fine previously.