Pros: 3 Trouble Signs Every Investor Should Watch By: CNBC.com News July 27, 2011 at 13:55 PM EDT On Wednesday the Fast Money traders were squarely focused on 3 key developments that may signal serious challenges lie ahead for the stocks. Read More >> Related Stocks: 3M Co Banco Bilbao Viscaya Argentaria S.A. ADR Banco Santander ADR Bbva Banco Frances S.A. Best Buy Caterpillar Cisco Systems Corning Deere & Co International Business Machines Juniper Networks Paychex United Parcel Service