https://finance.google.com/finance/converter now redirects to https://www.google.com/search Have they changed the url ?
I found a workaround this url is working: https://finance.google.co.uk/bctzjpnsun/converter
you can view old pages by inserting this 'bctzjpnsun' in the url. For instance portfolio view with issues in the layout: https://finance.google.co.uk/bctzjpnsun/portfolio?action=view&pid=1&pview=sview
They are unfortunately in the process of removing it to push a new sleek layout www.google.com/finance without portfolio management features.
Obviously many are complaining but that did not help when they said the would terminate Google Reader loved by millions which means you should plan for an alternative.
EDIT: They should have communicated more on this. Most feature are easily replicable in google spreadsheets using =GOOGLEFINANCE
function.