Runtime errors on OSX & Ruby 1.8/1.9

[igrigorik]

(M=ad12c4) igrigorik /git/yonde> irb -r 'lib/yonde'
Bond has detected EditLine and may not work with it. See the README's Limitations section.
ruby-1.9.2-p0 > y = Yonde.new
RuntimeError: bad event type or keysym "KP_Begin" during eval of: "bind .text0 \"\" { ::RubyFFI::event 6 \"\" %# %b %c %d %f %h %i %k %m %o %p %s %t %w %x %y %A %B %D %E %K %N %P %R %S %T %W %X %Y }"
    from /Users/igrigorik/.rvm/gems/ruby-1.9.2-p0/gems/ffi-tk-2010.08.23/lib/ffi-tk/ffi/tcl/interp.rb:96:in `eval'
    from /Users/igrigorik/.rvm/gems/ruby-1.9.2-p0/gems/ffi-tk-2010.08.23/lib/ffi-tk/event/handler.rb:35:in `register'
    from /Users/igrigorik/.rvm/gems/ruby-1.9.2-p0/gems/ffi-tk-2010.08.23/lib/ffi-tk/command/bind.rb:8:in `bind'
    from /Users/igrigorik/.rvm/gems/ruby-1.9.2-p0/gems/ffi-tk-2010.08.23/lib/ffi-tk/command/bind.rb:21:in `bind'
    from /Users/igrigorik/Development/github/yonde/lib/yonde/controller.rb:86:in `key'
    from /Users/igrigorik/Development/github/yonde/lib/yonde/controller.rb:56:in `initialize'
    from /Users/igrigorik/Development/github/yonde/lib/yonde.rb:23:in `new'
    from /Users/igrigorik/Development/github/yonde/lib/yonde.rb:23:in `initialize'
    from (irb):1:in `new'
    from (irb):1
    from /Users/igrigorik/.rvm/rubies/ruby-1.9.2-p0/bin/irb:17:in `'

(M=ad12c4) igrigorik /git/yonde> irb -r 'lib/yonde'
/opt/local/lib/ruby/gems/1.8/gems/ffi-tk-2010.08.23/lib/ffi-tk/ffi/tcl/obj.rb:12:in `gsub':TypeError: can't convert Hash into String

Any ideas / suggestions?