{blackbabes} Lauryn Hill Accused of Being a NIGHTMARE Behind the Scenes

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Lauryn Hill would constantly verbally abuse members of her band behind the scenes of her European tour in 2007 ... so says an ex-band member who filed a new lawsuit against the former Fugees singer.

Professional guitar player Jay Gore has filed new legal docs in his war with Hill -- in which he claims she stiffed him out of thousands of dollars after playing Hill's tour.

In the docs, Gore says Hill was a total monster backstage -- claiming she "exhibited the type of behavior for which she had gained public notoriety which contributed to a hostile work environment."

Gore says, "After shows, Hill would demand that the musicians and road support personnel attend meetings where she would engage in a person-by-person critique and berating."

He continues, "At one point, Hill made a statement in front of the tour personnel to the effect that 'I can't believe I am paying you fools, you should be paying me.'"

Gore says he now wants more than $20k for his troubles. His lawyer, Nicholas Andrea, tells us, "We believe there are other musicians who have been mistreated by Ms. Hill in a similar manner who are reluctant to stand up for their rights and this lawsuit gives them a voice as well."

Calls to Hill's rep have not been returned.