The Dow Jones Industrial Average (DJI) endured another session of up-and-down activity, but ended trading at its worst price in nearly four months. "We had some positive housing data this morning, but the market once again failed to hold on to its early gains," claimed Schaeffer's Senior Equity Analyst Joe Bell. "There are more worries about whether Greece will remain in the euro zone, and what will come of its June election. While many investors continue to flee the euro for the U.S. dollar, the equity markets are being weighed down by uncertainty."

Keep reading to see what else was on our radar today:

• Problems in Greece also prove detrimental for commodities.
• What does the 50-day moving average mean to the S&P 500 Index (SPX)?
• The VIX solidified its loftiest perch in 2012.
• Plus, see what's cooking ahead of Facebook's (FB) Friday IPO.

The Dow Jones Industrial Average (DJI – 12,598.55) tagged a session high of 12,722.63 this morning, but ended the day down 33.5 points, or 0.3%, just barely above its session low of 12,597.34. Today marked the lowest close for the Dow since Jan 18. Seventeen out of its 30 blue chips ended with deficits, as Bank of America (BAC) led the laggards with a 2.6% drop. General Electric's (GE) 3.3% jump paced the 13 outperforming issues.

The S&P 500 Index (SPX – 1,324.80) penetrated the 1,330 level by the time the dust settled, falling 5.9 points, or 0.4%. The Nasdaq Composite (COMP – 2,874.04) turned in the worst performance of its fellow benchmarks, peeling back 19.7 points, or 0.7%.

The CBOE Market Volatility Index (VIX – 22.27) gained 1.4% today, and ended above the 22 mark for the first time since Jan 17. The VIX settled below its session peak of 22.69, and touched its highest daily point in 2012.

Today's highlight: Although Wall Street caught an early lift from upbeat housing and industrial production data, stocks just couldn't maintain their positive momentum. "There isn't a lot to hold your hat on," Bell suggests, "as every bounce seems to be met with more selling pressure."

Turning to today's major market stories...

• This week's Investors Intelligence (II) survey displayed a notable increase in bearish sentiment.
• Joe Bell rounded up some pre-IPO buzz on Facebook (FB).
• Options bears are looking for a continued retreat in Apple (AAPL) and Chesapeake Energy (CHK).
• Analysts weighed in on chip makers TriQuint Semiconductor (TQNT) and KLA-Tencor (KLAC).
• New highs and new lows: Lennar (LEN) and Banco Santander (STD) were among the standouts in today's session.
• Back-month call activity heats up on Cheesecake Factory (CAKE).
• Meanwhile, back-month puts were used in a debit spread on Dell (DELL).
• Schaeffer's Senior Technical Strategist Ryan Detrick eyed something bullish with the SPX's 50-day trendline.
• Columnist Adam Warner explored market correlation and the climbing VIX.

For today's activity in commodities, options, and more, head to page 2.