Can someone help with MRP40

I am another MRP40 user, a registered one who paid for the program and was using it with my Icom 7300. But on moving up to a Flex 6400 am having difficulties getting it to work completely. I do believe I am almost 90% of the way there and it IS decoding CW perfectly, and it is also sending to the radio, because I can clearly see the signals coming into the TX Stream in my DAX. I created a new COM port COM5, using smart SDRCat and assigned it to MRP40. The only problem I am having it it will not put the radio into transmit with PTT. So sound in is working and decoding, sound out is working and I can see it in the TX stream. Both levels are clearly working and adjustable with the DAX level controls and I have a connected com port, just no PTT to ask the radio to transmit. Can anyone help me with this because I believe I am close. Previous comments said it would not decode properly with a Flex, but that part is working perfectly. Thanks All:-)