I installed the newest version but when trying to start I get this error now:
/Users/max/.rvm/gems/ruby-1.9.3-p448/gems/mastercoin-wallet-0.0.9/lib/mastercoin-wallet/gui/main_window.rb:144:in `add_purchase_row': undefined method `[]' for nil:NilClass (NoMethodError)
from /Users/max/.rvm/gems/ruby-1.9.3-p448/gems/mastercoin-wallet-0.0.9/lib/mastercoin-wallet/gui/main_window.rb:164:in `block in load_transactions'
from /Users/max/.rvm/gems/ruby-1.9.3-p448/gems/mastercoin-wallet-0.0.9/lib/mastercoin-wallet/gui/main_window.rb:163:in `each'
from /Users/max/.rvm/gems/ruby-1.9.3-p448/gems/mastercoin-wallet-0.0.9/lib/mastercoin-wallet/gui/main_window.rb:163:in `load_transactions'
from /Users/max/.rvm/gems/ruby-1.9.3-p448/gems/mastercoin-wallet-0.0.9/lib/mastercoin-wallet/gui/main_window.rb:112:in `update'
from /Users/max/.rvm/gems/ruby-1.9.3-p448/gems/mastercoin-wallet-0.0.9/lib/mastercoin-wallet/gui/main_window.rb:75:in `initialize'
from /Users/max/.rvm/gems/ruby-1.9.3-p448/gems/mastercoin-wallet-0.0.9/bin/mastercoin-wallet:10:in `new'
from /Users/max/.rvm/gems/ruby-1.9.3-p448/gems/mastercoin-wallet-0.0.9/bin/mastercoin-wallet:10:in `'
from /Users/max/.rvm/gems/ruby-1.9.3-p448/bin/mastercoin-wallet:23:in `load'
from /Users/max/.rvm/gems/ruby-1.9.3-p448/bin/mastercoin-wallet:23:in `'
from /Users/max/.rvm/gems/ruby-1.9.3-p448/bin/ruby_executable_hooks:15:in `eval'
from /Users/max/.rvm/gems/ruby-1.9.3-p448/bin/ruby_executable_hooks:15:in `'
I am going to try and replicate this. Could you try removing your config so you have a clean state? It's ~/.mastercoin-wallet/config.json.