The major averages, after erasing early gains, headed into the close little changed. But several leading stocks on the IBD 50 list sold off in the wake of poorly received earnings reports. That's a bad sign for the general market. Sherwin-Williams (SHW), paint maker and retailer, just edged past earnings forecasts Thursday morning, but sales fell shy. The 5% revenue gain was the worst in 10 quarters, even as housing has ramped up. The company also