A disciplinary panel affirmed the recommended four-month suspension of a west suburban Itasca lawyer who was accused of forging signatures on four separate documents sent to clients.The Attorney Registration & Disciplinary Commission Review Board, which acts as an appeals panel, was not persuaded by Robert R. Czarnik’s argument that handwriting expert Diane Marsh lacked credibility.“Given the detailed analysis in Marsh’s report and testimony, as well as in the [h]earing [b]oard’s explanation of …