Score another point for Mark Cuban in SEC battle

The lawsuit, filed in U.S. District Court in Washington, accuses the commission of improperly rejecting requests to access some evidence, being too slow to respond to some requests, and not trying hard enough to find all the documentation Cuban's attorneys requested.

And now for more bad news for the SEC: The Wall Street Journal reports (subscription required) that "The inspector general of the Securities and Exchange Commission is investigating allegations that enforcement staff engaged in misconduct in connection with the insider trading case filed last fall against Mark Cuban."

The investigation was of course spurred by complains from Cuban's legal team, so it can't be called a real setback for the SEC unless there's some sort of unfavorable outcome. But for the $750,000 Cuban is accused of saving by dumping the MAMA.com shares, this case is turning out to be quite the headache for the SEC -- and Cuban loves a good fight, so this one seems destined to drag on until either Cuban is convicted or acquitted or the SEC drops the charges.