Lenders snarled in the legal thicket over shoddy U.S.  foreclosure procedures have so far avoided national class action lawsuits from homeowners, largely because borrowers cannot demonstrate economic harm, according to plaintiff lawyers.

Several large plaintiff firms circled around banks when reports of problems with foreclosure affidavits snowballed in late September.

But as servicers like Bank of America Corp, Ally Financial and JPMorgan Chase attempt to resolve a 50-state probe into their practices — and other legal challenges — big class action lawyers have taken a pass on diving into the mess.

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