Braintree
1. Open app/design/frontend/base/default/template/braintree/form.phtml and find the following lines:
if ($$('#onestepcheckout-form').first() && !loggedIn) { $('id_create_account').observe('change', function() { $('_store_in_vault_div').toggle(); }); }2. Replace them with :
if ($$('#onestepcheckout-form').first() && !loggedIn) { $('id_create_account').observe('change', function() { $('_store_in_vault_div').toggle(); }); } else if ($('firecheckout-form') && !loggedIn) { // do nothing }3. Save the file and clear cache.