pmdg 737ng and saving

Hello everyone i have a problem with the pmdg 737 and saving.When i save a flight with the ; button in FS2004 and later on i start that flight again, all my data from the FMC is lost and i have to put it in all again. This is with the PMDG 737. With the PMDG MD11 this does not occur and the data is still in the FMC. Is this a known problem? Cause when i like to practice f.e auto landings it is easier if i can save just before landing and then do that over and over again till it's good. Once again, i only have this problem with the pmdg 737, the pmdg MD11 works fine and the data stays in the FMC.thnx Remy van de Mortel