Wall Street Roundup: A bug in the system. Stewart on Goldman.

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Gold: Trading now at $1,519 per ounce, down 2.2% from Wednesday. Dow Jones industrial average: Trading now at 11906.31, down 1.7% from Wednesday.

Down again. This week’s unemployment data were disappointing, sending stocks plunging and raising the question of whether the gains of the last few days were only a head fake.

A bug in the system. As the Greek financial crisis heads toward some kind of climax, analysts are wondering whether there could be some hidden weakness in the system that could make the damage wider than expected.

Presidential visit. President Obama comes to New York on Thursday in an effort to win back some of the hedge fund magnates who have defected since his election.

Nothing personal. When JPMorgan settled with the Securities and Exchange Commission on Monday no individual bankers were named, provoking debate again about why investigators have had such difficulty in bringing Wall Street to justice.

Stewart on Goldman. Jon Stewart used a segment about the Greek crisis to poke a finger in the eye of Goldman Sachs.

-- Nathaniel Popper