This is 100% true!!! Yes there is a sofware update for the transmission. My 98 CLK 320 exhibited some jerkiness when starting out in first and also when slowing down to a stop. I'll have to admit that it was very difficult trying to explain the problems but the dealer kept the car overnight to try to duplicate the problem and agreed to update the software in the transmission control module and also changed the valve body if I'm not mistaken.
Now the car drives much better! Upshifts and downshifts seem much more responsive and the tranny also "adapts" much better.