Last week, a furious Ridsdale described the delay of Langston's claim the "worst possible outcome" for the club and blamed it on the Swiss-based firm.
Langston's lawyers claimed the delay was due to Cardiff "not presenting its evidence in a timely manner".
Langston, Cardiff's biggest creditor, wants the £24m debt repaid now, but Bluebirds officials insist the sum is not due until 2016.