aquapolar

I have a windows 7 64 bit and have several Jazz T40's that communicate perfectly with my USB to rs232. Got 5 new boxes and try to load code to the new T40's using the same cables and same settings. To my surprise...no luck. It does not work, call tech support but they were just living for the day. Are there any changes that need to be made in the communication settings for these new T40 PLC's to work? Need urgent assistance. Again, I'm using MJ20-RA with Mj10-22-cs25 cable. "That works well with my old boxes but not with the new ones"!!!!