import React from 'react';
import { Accounts } from 'meteor/accounts-base';

export class FormMessage extends React.Component {
  render () {
    let { message, type, className = "message", style = {} } = this.props;
    return message ? (
      <div style={ style } 
           className={[ className, type ].join(' ')}>{ message }</div>
    ) : null;
  }
}

Accounts.ui.FormMessage = FormMessage;

import React from 'react';
import { Accounts } from 'meteor/accounts-base';

export class FormMessage extends React.Component {
  render () {
    let { message, type, className = "message", style = {} } = this.props;
    message = _.isObject(message) ? message.message : message; // If message is object, then try to get message from it
    return message ? (
      <div style={ style } 
           className={[ className, type ].join(' ')}>{ message }</div>
    ) : null;
  }
}

Accounts.ui.FormMessage = FormMessage;

Fix issue, when message is object
Fix issue, when message is object

I don`t now, what happend and in witch version of meteor. But I`ve had troubles with 
meteor/std:accounts-ui
and
zetoff:accounts-material-ui

It`s fast simple fix, checked on meteor 1.4.1 and 1.4.2