I had the same problem...the problem is the wxwidgets not being up to date! Here's the fix that worked for me: http://wiki.wxpython.org/InstallingOnUbuntuOrDebian
It doesn't seem to have a specific version for Oneiric/Mint12 yet, so I used the Natty one...hope this helps.
thanks so much - forum contributors to the rescue once again,
the link provides very straightforward instructions - it is fascinating to watch the installation text flowing into the terminal window, I am even beginning to recognise and understand something of what is going on! - and Filezilla is now functioning