Stocks at New Highs: Here's the Problem By: CNBC.com News February 05, 2013 at 09:51 AM EST One problem with stocks at new highs: Corporate buybacks have been dropping, hitting an eight-month low last week, according to TrimTabs. Read More >> Related Stocks: Armstrong World Industries Inc Barclays Plc ADR KB Home Owens Corning Inc PulteGroup Stanley Black & Decker Toll Brothers Inc